I has a some problem with my project in 4.21 (from 4.20). Below you can see cannons that a skeletal meshes with anim bp. I setting up then during runtime by cpp code.
Below are PIE with DirectX, all seems fine.
But when I launching mobile preview or enabling android preview (ES2) cannons disappears, they just didn’t want to setup for some reason.
Used Debug in VS for check what went wrong, but code work fine.