Related to this old thread? Lots of people have commented here again and an Apple rep has responded a few hours ago saying they are looking into it.
https://developer.apple.com/forums/thread/701330?answerId=738741022#738741022
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@omiisdope to help merge threads, do you get the same errors as in this thread? https://forums.developer.apple.com/forums/thread/748129
You'll just need to scroll up a little bit in the terminal to see it if it's there.
Should be right before these lines
==> Formula
Tap: apple/apple
Path: /usr/local/Homebrew/Library/Taps/apple/homebrew-apple/Formula/game-porting-toolkit.rb