This was also happening to us! It turned out to be a race condition in one legacy code we had executing on a +(void) load method that was calling another module (presumably) before that module was loaded..
this code used the filesystem to fetch some info to put on a ui component later.
still unsure on why this only happens on iOS 15 tho, I couldn't find documentation about changes on how dynamic libs are loaded on iOS 15
This is the method in our case at least, that was being called on a load Obj-C Method imageWithContentsOfFile https://developer.apple.com/documentation/uikit/uiimage/1624123-imagewithcontentsoffile
Frugoman
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Has anyone encountered a fix for this? we had to run our tests on iOS 14 as a workaround, but it's no good.