diff --git a/scalafmt-tests/shared/src/test/resources/newlines/source_classic.stat b/scalafmt-tests/shared/src/test/resources/newlines/source_classic.stat
index 7c6bcb3c95..1cdc231591 100644
--- a/scalafmt-tests/shared/src/test/resources/newlines/source_classic.stat
+++ b/scalafmt-tests/shared/src/test/resources/newlines/source_classic.stat
@@ -11291,3 +11291,37 @@ object a {
     quux(x)
   }
 }
+<<< #4133 select with braced apply and single function arg, !parensForOneLineApply
+maxColumn = 74
+newlines {
+  avoidForSimpleOverflow = [punct, slc, tooLong]
+  ignoreInSyntax = false
+}
+rewrite.rules = [RedundantBraces]
+rewrite.redundantBraces.parensForOneLineApply = false
+===
+  topLevelStatementBlankLines.filter(x => x.minNest <= x.maxNest).sortBy { x =>
+    (x.minBreaks, x.maxNest, -x.minNest, x.regex.fold(0)(-_.length))
+  }
+>>>
+topLevelStatementBlankLines.filter(x => x.minNest <= x.maxNest).sortBy {
+  x =>
+    (x.minBreaks, x.maxNest, -x.minNest, x.regex.fold(0)(-_.length))
+}
+<<< #4133 select with braced apply and single function arg, parensForOneLineApply
+maxColumn = 74
+newlines {
+  avoidForSimpleOverflow = [punct, slc, tooLong]
+  ignoreInSyntax = false
+}
+rewrite.rules = [RedundantBraces]
+rewrite.redundantBraces.parensForOneLineApply = true
+===
+  topLevelStatementBlankLines.filter(x => x.minNest <= x.maxNest).sortBy { x =>
+    (x.minBreaks, x.maxNest, -x.minNest, x.regex.fold(0)(-_.length))
+  }
+>>>
+topLevelStatementBlankLines.filter(x => x.minNest <= x.maxNest).sortBy {
+  x =>
+    (x.minBreaks, x.maxNest, -x.minNest, x.regex.fold(0)(-_.length))
+}
diff --git a/scalafmt-tests/shared/src/test/resources/newlines/source_fold.stat b/scalafmt-tests/shared/src/test/resources/newlines/source_fold.stat
index 23a3b3ce96..93a12efd14 100644
--- a/scalafmt-tests/shared/src/test/resources/newlines/source_fold.stat
+++ b/scalafmt-tests/shared/src/test/resources/newlines/source_fold.stat
@@ -10532,3 +10532,36 @@ object a {
     quux(x)
   }
 }
+<<< #4133 select with braced apply and single function arg, !parensForOneLineApply
+maxColumn = 74
+newlines {
+  avoidForSimpleOverflow = [punct, slc, tooLong]
+  ignoreInSyntax = false
+}
+rewrite.rules = [RedundantBraces]
+rewrite.redundantBraces.parensForOneLineApply = false
+===
+  topLevelStatementBlankLines.filter(x => x.minNest <= x.maxNest).sortBy { x =>
+    (x.minBreaks, x.maxNest, -x.minNest, x.regex.fold(0)(-_.length))
+  }
+>>>
+topLevelStatementBlankLines.filter(x => x.minNest <= x.maxNest).sortBy {
+  x => (x.minBreaks, x.maxNest, -x.minNest, x.regex.fold(0)(-_.length))
+}
+<<< #4133 select with braced apply and single function arg, parensForOneLineApply
+maxColumn = 74
+newlines {
+  avoidForSimpleOverflow = [punct, slc, tooLong]
+  ignoreInSyntax = false
+}
+rewrite.rules = [RedundantBraces]
+rewrite.redundantBraces.parensForOneLineApply = true
+===
+  topLevelStatementBlankLines.filter(x => x.minNest <= x.maxNest).sortBy { x =>
+    (x.minBreaks, x.maxNest, -x.minNest, x.regex.fold(0)(-_.length))
+  }
+>>>
+topLevelStatementBlankLines.filter(x => x.minNest <= x.maxNest)
+  .sortBy { x =>
+    (x.minBreaks, x.maxNest, -x.minNest, x.regex.fold(0)(-_.length))
+  }
diff --git a/scalafmt-tests/shared/src/test/resources/newlines/source_keep.stat b/scalafmt-tests/shared/src/test/resources/newlines/source_keep.stat
index a19dd2a15b..c7d56c4045 100644
--- a/scalafmt-tests/shared/src/test/resources/newlines/source_keep.stat
+++ b/scalafmt-tests/shared/src/test/resources/newlines/source_keep.stat
@@ -11043,3 +11043,37 @@ object a {
     quux(x)
   }
 }
+<<< #4133 select with braced apply and single function arg, !parensForOneLineApply
+maxColumn = 74
+newlines {
+  avoidForSimpleOverflow = [punct, slc, tooLong]
+  ignoreInSyntax = false
+}
+rewrite.rules = [RedundantBraces]
+rewrite.redundantBraces.parensForOneLineApply = false
+===
+  topLevelStatementBlankLines.filter(x => x.minNest <= x.maxNest).sortBy { x =>
+    (x.minBreaks, x.maxNest, -x.minNest, x.regex.fold(0)(-_.length))
+  }
+>>>
+topLevelStatementBlankLines.filter(x => x.minNest <= x.maxNest).sortBy {
+  x =>
+    (x.minBreaks, x.maxNest, -x.minNest, x.regex.fold(0)(-_.length))
+}
+<<< #4133 select with braced apply and single function arg, parensForOneLineApply
+maxColumn = 74
+newlines {
+  avoidForSimpleOverflow = [punct, slc, tooLong]
+  ignoreInSyntax = false
+}
+rewrite.rules = [RedundantBraces]
+rewrite.redundantBraces.parensForOneLineApply = true
+===
+  topLevelStatementBlankLines.filter(x => x.minNest <= x.maxNest).sortBy { x =>
+    (x.minBreaks, x.maxNest, -x.minNest, x.regex.fold(0)(-_.length))
+  }
+>>>
+topLevelStatementBlankLines.filter(x => x.minNest <= x.maxNest).sortBy {
+  x =>
+    (x.minBreaks, x.maxNest, -x.minNest, x.regex.fold(0)(-_.length))
+}
diff --git a/scalafmt-tests/shared/src/test/resources/newlines/source_unfold.stat b/scalafmt-tests/shared/src/test/resources/newlines/source_unfold.stat
index bb241988e2..ff1ad0be38 100644
--- a/scalafmt-tests/shared/src/test/resources/newlines/source_unfold.stat
+++ b/scalafmt-tests/shared/src/test/resources/newlines/source_unfold.stat
@@ -11471,3 +11471,39 @@ object a {
     quux(x)
   }
 }
+<<< #4133 select with braced apply and single function arg, !parensForOneLineApply
+maxColumn = 74
+newlines {
+  avoidForSimpleOverflow = [punct, slc, tooLong]
+  ignoreInSyntax = false
+}
+rewrite.rules = [RedundantBraces]
+rewrite.redundantBraces.parensForOneLineApply = false
+===
+  topLevelStatementBlankLines.filter(x => x.minNest <= x.maxNest).sortBy { x =>
+    (x.minBreaks, x.maxNest, -x.minNest, x.regex.fold(0)(-_.length))
+  }
+>>>
+topLevelStatementBlankLines
+  .filter(x => x.minNest <= x.maxNest)
+  .sortBy { x =>
+    (x.minBreaks, x.maxNest, -x.minNest, x.regex.fold(0)(-_.length))
+  }
+<<< #4133 select with braced apply and single function arg, parensForOneLineApply
+maxColumn = 74
+newlines {
+  avoidForSimpleOverflow = [punct, slc, tooLong]
+  ignoreInSyntax = false
+}
+rewrite.rules = [RedundantBraces]
+rewrite.redundantBraces.parensForOneLineApply = true
+===
+  topLevelStatementBlankLines.filter(x => x.minNest <= x.maxNest).sortBy { x =>
+    (x.minBreaks, x.maxNest, -x.minNest, x.regex.fold(0)(-_.length))
+  }
+>>>
+topLevelStatementBlankLines
+  .filter(x => x.minNest <= x.maxNest)
+  .sortBy { x =>
+    (x.minBreaks, x.maxNest, -x.minNest, x.regex.fold(0)(-_.length))
+  }
diff --git a/scalafmt-tests/shared/src/test/resources/scala3/OptionalBraces.stat b/scalafmt-tests/shared/src/test/resources/scala3/OptionalBraces.stat
index b4a0d0faa7..f976cc7e7d 100644
--- a/scalafmt-tests/shared/src/test/resources/scala3/OptionalBraces.stat
+++ b/scalafmt-tests/shared/src/test/resources/scala3/OptionalBraces.stat
@@ -7840,3 +7840,42 @@ object a:
 >>>
 object a:
    def func(f: ->{a, b, c} B): Unit
+<<< #4133 select with braced apply and single function arg, within interpolation
+maxColumn = 70
+rewrite.rules = [RedundantBraces]
+===
+s"`$name0${index.toString.toCharArray.nn.map {x => (x - '0' + '₀').toChar}.mkString}`"
+>>>
+s"`$name0${index.toString.toCharArray.nn.map { x =>
+    (x - '0' + '₀').toChar
+  }.mkString}`"
+<<< #4133 select with braced apply, single function arg in second clause
+maxColumn = 66
+rewrite.rules = [RedundantBraces]
+===
+next.fold {
+  resultsDiv.appendChild(m.toHTML)
+} { next =>
+  resultsDiv.insertBefore(m.toHTML, next)
+}
+>>>
+next.fold {
+  resultsDiv.appendChild(m.toHTML)
+} { next =>
+  resultsDiv.insertBefore(m.toHTML, next)
+}
+<<< #4133 select with braced apply, single function arg, within another apply
+maxColumn = 66
+rewrite.rules = [RedundantBraces]
+===
+lazy val onlyImplicitOrTypeParams = paramss.forall(
+  _.exists { sym =>
+    sym.isType || sym.is(Implicit) || sym.is(Given)
+  }
+)
+>>>
+lazy val onlyImplicitOrTypeParams = paramss.forall(
+  _.exists { sym =>
+    sym.isType || sym.is(Implicit) || sym.is(Given)
+  }
+)
diff --git a/scalafmt-tests/shared/src/test/resources/scala3/OptionalBraces_fold.stat b/scalafmt-tests/shared/src/test/resources/scala3/OptionalBraces_fold.stat
index dfbd5e5149..fafb4244a1 100644
--- a/scalafmt-tests/shared/src/test/resources/scala3/OptionalBraces_fold.stat
+++ b/scalafmt-tests/shared/src/test/resources/scala3/OptionalBraces_fold.stat
@@ -7539,3 +7539,37 @@ object a:
 >>>
 object a:
    def func(f: ->{a, b, c} B): Unit
+<<< #4133 select with braced apply and single function arg, within interpolation
+maxColumn = 70
+rewrite.rules = [RedundantBraces]
+===
+s"`$name0${index.toString.toCharArray.nn.map {x => (x - '0' + '₀').toChar}.mkString}`"
+>>>
+s"`$name0${index.toString.toCharArray.nn
+    .map(x => (x - '0' + '₀').toChar).mkString}`"
+<<< #4133 select with braced apply, single function arg in second clause
+maxColumn = 66
+rewrite.rules = [RedundantBraces]
+===
+next.fold {
+  resultsDiv.appendChild(m.toHTML)
+} { next =>
+  resultsDiv.insertBefore(m.toHTML, next)
+}
+>>>
+next.fold(resultsDiv.appendChild(m.toHTML)) { next =>
+  resultsDiv.insertBefore(m.toHTML, next)
+}
+<<< #4133 select with braced apply, single function arg, within another apply
+maxColumn = 66
+rewrite.rules = [RedundantBraces]
+===
+lazy val onlyImplicitOrTypeParams = paramss.forall(
+  _.exists { sym =>
+    sym.isType || sym.is(Implicit) || sym.is(Given)
+  }
+)
+>>>
+lazy val onlyImplicitOrTypeParams = paramss.forall(_.exists { sym =>
+  sym.isType || sym.is(Implicit) || sym.is(Given)
+})
diff --git a/scalafmt-tests/shared/src/test/resources/scala3/OptionalBraces_keep.stat b/scalafmt-tests/shared/src/test/resources/scala3/OptionalBraces_keep.stat
index ce1de549ad..d4b2ca4e2f 100644
--- a/scalafmt-tests/shared/src/test/resources/scala3/OptionalBraces_keep.stat
+++ b/scalafmt-tests/shared/src/test/resources/scala3/OptionalBraces_keep.stat
@@ -7864,3 +7864,42 @@ object a:
 >>>
 object a:
    def func(f: ->{a, b, c} B): Unit
+<<< #4133 select with braced apply and single function arg, within interpolation
+maxColumn = 70
+rewrite.rules = [RedundantBraces]
+===
+s"`$name0${index.toString.toCharArray.nn.map {x => (x - '0' + '₀').toChar}.mkString}`"
+>>>
+s"`$name0${index.toString.toCharArray.nn.map { x =>
+    (x - '0' + '₀').toChar
+  }.mkString}`"
+<<< #4133 select with braced apply, single function arg in second clause
+maxColumn = 66
+rewrite.rules = [RedundantBraces]
+===
+next.fold {
+  resultsDiv.appendChild(m.toHTML)
+} { next =>
+  resultsDiv.insertBefore(m.toHTML, next)
+}
+>>>
+next.fold {
+  resultsDiv.appendChild(m.toHTML)
+} { next =>
+  resultsDiv.insertBefore(m.toHTML, next)
+}
+<<< #4133 select with braced apply, single function arg, within another apply
+maxColumn = 66
+rewrite.rules = [RedundantBraces]
+===
+lazy val onlyImplicitOrTypeParams = paramss.forall(
+  _.exists { sym =>
+    sym.isType || sym.is(Implicit) || sym.is(Given)
+  }
+)
+>>>
+lazy val onlyImplicitOrTypeParams = paramss.forall(
+  _.exists { sym =>
+    sym.isType || sym.is(Implicit) || sym.is(Given)
+  }
+)
diff --git a/scalafmt-tests/shared/src/test/resources/scala3/OptionalBraces_unfold.stat b/scalafmt-tests/shared/src/test/resources/scala3/OptionalBraces_unfold.stat
index 711cc3daaf..1675e854c6 100644
--- a/scalafmt-tests/shared/src/test/resources/scala3/OptionalBraces_unfold.stat
+++ b/scalafmt-tests/shared/src/test/resources/scala3/OptionalBraces_unfold.stat
@@ -8158,3 +8158,47 @@ object a:
 >>>
 object a:
    def func(f: ->{a, b, c} B): Unit
+<<< #4133 select with braced apply and single function arg, within interpolation
+maxColumn = 70
+rewrite.rules = [RedundantBraces]
+===
+s"`$name0${index.toString.toCharArray.nn.map {x => (x - '0' + '₀').toChar}.mkString}`"
+>>>
+s"`$name0${index
+    .toString
+    .toCharArray
+    .nn
+    .map { x =>
+      (x - '0' + '₀').toChar
+    }
+    .mkString}`"
+<<< #4133 select with braced apply, single function arg in second clause
+maxColumn = 66
+rewrite.rules = [RedundantBraces]
+===
+next.fold {
+  resultsDiv.appendChild(m.toHTML)
+} { next =>
+  resultsDiv.insertBefore(m.toHTML, next)
+}
+>>>
+next.fold {
+  resultsDiv.appendChild(m.toHTML)
+} { next =>
+  resultsDiv.insertBefore(m.toHTML, next)
+}
+<<< #4133 select with braced apply, single function arg, within another apply
+maxColumn = 66
+rewrite.rules = [RedundantBraces]
+===
+lazy val onlyImplicitOrTypeParams = paramss.forall(
+  _.exists { sym =>
+    sym.isType || sym.is(Implicit) || sym.is(Given)
+  }
+)
+>>>
+lazy val onlyImplicitOrTypeParams = paramss.forall(
+  _.exists { sym =>
+    sym.isType || sym.is(Implicit) || sym.is(Given)
+  }
+)
diff --git a/scalafmt-tests/shared/src/test/scala/org/scalafmt/FormatTests.scala b/scalafmt-tests/shared/src/test/scala/org/scalafmt/FormatTests.scala
index 2814e64498..9fb812073c 100644
--- a/scalafmt-tests/shared/src/test/scala/org/scalafmt/FormatTests.scala
+++ b/scalafmt-tests/shared/src/test/scala/org/scalafmt/FormatTests.scala
@@ -144,7 +144,7 @@ class FormatTests extends FunSuite with CanRunTests with FormatAssertions {
     val explored = Debug.explored.get()
     logger.debug(s"Total explored: $explored")
     if (!onlyUnit && !onlyManual)
-      assertEquals(explored, 1183640, "total explored")
+      assertEquals(explored, 1186090, "total explored")
     val results = debugResults.result()
     // TODO(olafur) don't block printing out test results.
     // I don't want to deal with scalaz's Tasks :'(