Version '2019.3.15f1 (59ff3e03856d)', Build type 'Release', Scripting Backend 'il2cpp', CPU 'arm64-v8a' This problem happen only when i switch api i have 46 scene using vuforia and was working fine but playstore now require api 31 so when i switched the app launch fine the first scene but when i try to load other scenes it crash (it's not about my code bc it was fine before) it work fine using 30 scene but adding more it crash when adding more scenes like 35 , a scene that was working fine will crash
Unity 2019 is no longer supported, thus no fixes will provided for Unity 2019, you need to update to more recent LTS.
Updating to recent unity versions break my references and components from fbx object get removed for no reason
To which version are you updating, I would suggest updating by minor version? 2019->2020.1->2020.2 and so on.
I would suggest submitting a bug then, since Unity 2020 will be deprecated too in the beginning of summer