IL2CPP compatibility in iOS

My game based on Physics2D has feature that playback a replay data by simulating user Input.
But, In iOS enabled IL2CPP, playback does not work.
It seems to have a slight deviation.

Should i report to issue tracker ?
or avoid playback by simulating user Input ?

Last time I researched it, the Unity physics simulation was not guaranteed to be deterministic across devices or compilers. If anything runs in a different order on a different machine, or even the same machine, you will eventually have problems with accumulated rounding errors.