As far as I can tell, this is a limitation of Unreal’s rendering on Android, and not something we can fix in Cesium for Unreal. I described my understanding of the problem - and the best solution - in this message:
In short, I think you need to move the near plane farther away. And if that creates problems for rendering hands, you need to look into ways to move the hands to a separate rendering pass. A more general UE forum might have more insight here.
I noticed the UE 5.5 release notes have an experimental new First Person Rendering which sounds like it might be relevant. There’s a forum post with a little bit more information about how to enable it here: