Avatar Setup Doctor v1.7: now names the missing package and where to get it, finds shaders that go pink on Quest, and catches face issues (blink, lip sync, Write Defaults).
Free version to try. $9 bundle adds Clipping Checker.
https://jinxxy.com/kurodan/avatar-helper-bundle

Avatar won't upload? Pink materials or Missing Scripts after importing an outfit?

Avatar Setup Doctor finds the cause and shows how to fix it, right inside Unity. Free version available.

https://jinxxy.com/kurodan/avatar-setup-doctor