'brew doctor' warning

[mikutas]

❯ 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: Found Ruby file outside goodwithtech/r tap formula directory.
(/home/linuxbrew/.linuxbrew/Homebrew/Library/Taps/goodwithtech/homebrew-r/Formula):
  /home/linuxbrew/.linuxbrew/Homebrew/Library/Taps/goodwithtech/homebrew-r/dockle.rb

❯ brew --version
Homebrew 3.0.4
Homebrew/linuxbrew-core (git revision ca423; last commit 2021-03-09)

If I uninstall dockertags and untap goodwithtech/homebrew-r, the warning disappears.

❯ brew uninstall goodwithtech/r/dockertags
Uninstalling /home/linuxbrew/.linuxbrew/Cellar/dockertags/0.1.6... (5 files, 13.5MB)

❯ brew untap goodwithtech/homebrew-r
Untapping goodwithtech/r...
Untapped 2 formulae (134 files, 477.8KB).

❯ brew doctor
Your system is ready to brew.

If I re-install dockertags, the warning appears again.