iOS app from TestFlight cannot be opened due to Code signing

Code Signing General
jzilske OP
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One of our apps (built with Xcode 26.1.1 and distributed via TestFlight) crashes upon launch on iOS 17 with Exception Type: EXC_BAD_ACCESS (SIGKILL) and Termination Reason: CODESIGNING 2 Invalid Page.

I have never seen this before. Any pointers?

On iOS 18 & 26 this does not happen btw.

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iOS app from TestFlight cannot be opened due to Code signing
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