il2cpp rigidbody bug?

![mono][1]
mono


![il2cpp][2]
il2cpp




What should I do?
My unity version is 2017.3.1f1.

+ When I test it, I only get this problem when I use the Asset Bundle.

[1]: /storage/temp/113615-mono.gif [2]: /storage/temp/113616-il2cpp.gif