I have the same problem with my app since I mix new AASA iOS 13 format with old AASA format. It works on iOS 13, breaks on iOS 12 with the following console error log :
Download URL 'https://***/.well-known/apple-app-site-association' failed: -6756/0xFFFFE59C kTypeErr
Ded77
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Same here with iOS 14.5. I have not try to "Reset All Content and Settings" yet.
I have the issue on my old and new iPhones (7 & 12 mini). Maybe because I have disabled IDFA previously on iOS 13 before to migrate to iOS 14 ?
Same issue in Simulator (Rosetta) with Xcode 14.3, MacBook Pro M2 Max :/