diff --git a/Project.toml b/Project.toml
index 5dec6c4..554f125 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "FeatureTransforms"
 uuid = "8fd68953-04b8-4117-ac19-158bf6de9782"
 authors = ["Invenia Technical Computing Corporation"]
-version = "0.3.6"
+version = "0.3.7"
 
 [deps]
 Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"
diff --git a/src/apply.jl b/src/apply.jl
index cf69bd5..8837c27 100644
--- a/src/apply.jl
+++ b/src/apply.jl
@@ -118,7 +118,8 @@ the usual [`Transform`](@ref) being invoked.
 function apply_append(A::AbstractArray, t; append_dim, kwargs...)::AbstractArray
     result = apply(A, t; kwargs...)
     result = _postformat(cardinality(t), result, A, append_dim)
-    return cat(A, result; dims=append_dim)
+    # Conver result to Array to avoid clashing axis/key names in concatenated result
+    return cat(A, Array(result); dims=append_dim)
 end
 
 """
@@ -153,5 +154,5 @@ _postformat(::Cardinality, result, A, append_dim) = result
 function _postformat(::ManyToOne, result, A, append_dim)
     new_size = collect(size(A))
     setindex!(new_size, 1, dim(A, append_dim))
-    return reshape(result, new_size...)
+    return copy(reshape(result, new_size...))  # return a copy to remove the reshape type
 end
diff --git a/test/runtests.jl b/test/runtests.jl
index 2e9dd36..c79833b 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -1,5 +1,6 @@
 using AxisArrays
 using AxisKeys
+using Base: ReshapedArray
 using DataFrames: DataFrame
 using Dates
 using Documenter: doctest
diff --git a/test/types/matrix.jl b/test/types/matrix.jl
index f4b3fed..3724eb1 100644
--- a/test/types/matrix.jl
+++ b/test/types/matrix.jl
@@ -1,6 +1,11 @@
-@testset "matrix" begin
+# Want to test that certain subtypes of arrays are compatible
+_make_matrix(::Type{Matrix}) = [1 2 3; 4 5 6]
+_make_matrix(::Type{SubArray}) = view([1 2 3; 4 5 6], :, :)
+_make_matrix(::Type{ReshapedArray}) = reshape([1 2 3; 4 5 6], 2, 3)
 
-    x = [1 2 3; 4 5 6]
+@testset "$MatrixType" for MatrixType in (Matrix, SubArray, ReshapedArray)
+
+    x = _make_matrix(MatrixType)
 
     @test is_transformable(x)
 
diff --git a/test/types/xarray.jl b/test/types/xarray.jl
index f8bccdc..b7eac33 100644
--- a/test/types/xarray.jl
+++ b/test/types/xarray.jl
@@ -1,4 +1,4 @@
-@testset "$ArrayType" for ArrayType in (AxisArray, KeyedArray)
+@testset "$ArrayType" for ArrayType in (AxisArray, KeyedArray, NamedDimsArray)
 
     x = ArrayType([1 2 3; 4 5 6], foo=["a", "b"], bar=[:x, :y, :z])
 
@@ -114,7 +114,7 @@
 
     end
 
-    if ArrayType == KeyedArray
+    if ArrayType != AxisArray
         @testset "indexing with dims" begin
 
             T = FakeOneToOneTransform()