Skeletal Mesh Disappear on Mobile ES2 after update 4.21 ->Not bone count limit problem

I have a problem with my model. After updating to 4.21 it disappear on Android Builds and Editor preview Es2. The Bone count is 39 so it’s not the bone count limit.
I made an asset audit and got this.

And here is the difference between Shader5 and Es2



Find the same problem when tested 4.20 project on 4.21

I facing the same issue. I’m on 4.21.1after i build the apk the skeletal mesh is hidden in game. I don’t why this is happening. Maybe there is bug.​​​