Homebrew formula from #3 writes "unexpected files" (according to brew doctor)

[AlexanderWillner]

Description: Homebrew formula from #3 writes "unexpected files" (according to brew doctor). These are just warnings, the locations are fine (for brewed formulae), but
Version: 1.0.27 (fuse-t) / 13.5.1 (macOS on M1/M2)

Steps that will reproduce the problem?

1. Run brew reinstall macos-fuse-t/cask/fuse-t
2. Run brew doctor

What is the expected result?
Your system is ready to brew.

What happens instead?
See below.

Possible workaround:
Ignore it, it's just a warning. It seems that non-cask formulae write to /usr/local/Cellar/NAME/VERSION/lib and then some / few link these libraries to /usr/local/lib/.

Any additional information:

% brew doctor
Your system is ready to brew.
% brew reinstall macos-fuse-t/cask/fuse-t
...
% brew doctor                            
Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry or file an issue; just ignore this. Thanks!

Warning: Unbrewed dylibs were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.

Unexpected dylibs:
  /usr/local/lib/libfuse-t-1.0.27.dylib

Warning: Unbrewed '.pc' files were found in /usr/local/lib/pkgconfig.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.

Unexpected '.pc' files:
  /usr/local/lib/pkgconfig/fuse-t.pc

Warning: Unbrewed static libraries were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.

Unexpected static libraries:
  /usr/local/lib/libfuse-t-1.0.27.a

[vtwigt]

Still applies to FUSE-T 1.0.38:

% brew doctor
Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry or file an issue; just ignore this. Thanks!

Warning: Unbrewed dylibs were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae and may need to be deleted.

Unexpected dylibs:
  /usr/local/lib/libfuse-t-1.0.38.dylib

Warning: Unbrewed '.pc' files were found in /usr/local/lib/pkgconfig.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae and may need to be deleted.

Unexpected '.pc' files:
  /usr/local/lib/pkgconfig/fuse-t.pc

Warning: Unbrewed static libraries were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae and may need to be deleted.

Unexpected static libraries:
  /usr/local/lib/libfuse-t-1.0.38.a

[makorus]

Same here on my device, so this must be an issue with the cask itself. Would love to see this one fixed soon.

[nicfab]

Same here. I hope it will be fixed soon.

[alexfs]

This is not a problem, you should ignore those warnings.

[darrenoh]

I am trying to create a formula for ext4fuse, and Homebrew cannot find the fuse-t library. I suspect this issue is the reason.