Changing frontmatter causes cached "Rebuild failed" error in server that persists until restart

[jnvsor]

What version of Hugo are you using (hugo version)?

$ hugo version
hugo v0.125.1-68c5ad638c2072969e47262926b912e80fd71a77+extended linux/amd64 BuildDate=2024-04-18T08:21:19Z VendorInfo=gohugoio

Does this issue reproduce with the latest release?

Yes

---

I create a site per the quick start instructions:

hugo new site testbug
cd testbug/
git init
git submodule add https://github.com/theNewDynamic/gohugo-theme-ananke.git themes/ananke
echo "theme = 'ananke'" >> hugo.toml
hugo server

I create a small file with a yaml frontmatter:

---
title: Test
---

Change detected, rebuilding site (#1).
2024-04-18 14:51:23.022 +0200
Source changed /test.md
Web Server is available at http://localhost:1313/ (bind address 127.0.0.1)
Total in 3 ms

If I change the frontmatter type to toml and cause a syntax error:

+++
title: Test
+++

Change detected, rebuilding site (#2).
2024-04-18 14:51:28.022 +0200
Source changed /test.md
ERROR Rebuild failed: process: ".../testbug/content/test.md:2:6": unmarshal failed: toml: expected character =
Total in 0 ms

So far so good, only now no matter if I fix the syntax errors or switch back to the yaml delineation it continues to throw this error:

Change detected, rebuilding site (#3).
2024-04-18 14:51:33.022 +0200
Source changed /test.md
ERROR Rebuild failed: process: ".../testbug/content/test.md:2:6": unmarshal failed: toml: expected character =
Total in 0 ms

Since it shows the same line/char in the error message it's not simply a case of getting stuck on toml parsing when set back to yaml, and the site shows this error too.

Adding a new file can cause it to update showing 2 files changed:

---
title: Test 2
---

Change detected, rebuilding site (#4).
2024-04-18 14:54:45.022 +0200
Source changed /test2.md
Source changed /test.md
Web Server is available at http://localhost:1313/ (bind address 127.0.0.1)
Total in 1 ms

The site correctly livereloads to working order... However, if I perform the same routine with the second file and try to use the first file to trigger the update:

Change detected, rebuilding site (#5).
2024-04-18 14:55:43.022 +0200
Source changed /test2.md
ERROR Rebuild failed: process: ".../testbug/content/test2.md:2:6": unmarshal failed: toml: expected character =
Total in 0 ms

Change detected, rebuilding site (#6).
2024-04-18 14:55:45.022 +0200
Source changed /test2.md
ERROR Rebuild failed: process: ".../testbug/content/test2.md:2:6": unmarshal failed: toml: expected character =
Total in 0 ms

Change detected, rebuilding site (#7).
2024-04-18 14:55:52.522 +0200
Source changed /test.md
Source changed /test2.md
ERROR Rebuild failed: process: ".../testbug/content/test.md:2:6": unmarshal failed: toml: expected character =
Total in 0 ms

It falls back to the error it previously showed. Builds 3 6 and 7 in this example should have worked, so something seems to be cached that shouldn't be. Restarting the server clears these errors.

[jmooring]

Duplicate of #11378.

[github-actions]

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