It was a physical device. I didn't test with a simulator.
I tried to reproduce the situation with 15 ProMax, but I couldn't.
Actually I've got a lot of issue reports regarding this problem from users who are using our live app. These are the reported devices:
iPhone 12 Pro
iPhone 13 mini
iPhone 14 Pro
iPhone 15
iPhone 15 Pro
I have no idea but there's no iPhone 15 ProMax, either.