The issue first appeared more than 3 months ago.
https://forum.unity.com/threads/project-wont-build-using-xode15-release-candidate.1491761/#post-9341597
I guess both the Unity and the Xcode developers have no intension to fix this..
I posted the issue to the Flutter repo.
https://github.com/flutter/flutter/issues/138938
tennaaaaa
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Updating Unity to 2022.3.14f1 solved the issue (and caused another error seems not related to the issue).
I just had to detect isPressed state in ButtonStyle and trigger the animation.
It was pretty simple..
I am in the exact same situation right now...
Why are there no answers after a year?
I fixed it by not using UIViewController on the page.
Don't know that was the exact problem though since the view was dismissing at seeming completely unrelated timing.