I am facing the same issue. Apps don't launch on iOS 15 beta.
https://developer.apple.com/documentation/xcode/using-the-latest-code-signature-format
According to the link above, if the CodeDirectory v value is >= 20400, it shouldn't pose an issue.
But despite the apps have CodeDirectory value as 20400, apps are not launching and it seems that Apple is forcing me to re-sign or re-build all the existing apps.
tanjaria@celgene.com
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