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

hugo v0.121.2-6d5b44305eaa9d0a157946492a6f319da38de154+extended darwin/arm64 BuildDate=2024-01-05T12:21:15Z VendorInfo=brew

Does this issue reproduce with the latest release?

Yes

Description

fileExists and os.Stat report a file as existing but readDir fails, maybe the virtual filesystem doesn't apply to readDir?

I haven't test with mounts, but my expectation that either none should work or all.

See https://github.com/cmahnke/hugo-test
The template is in layouts/partials/dir-check.html