Metahuman disappear from scene and from outliner

Hi, I am rather newbie user of UE5, but there is a very annoying thing going on:
Every time I save the scene with metahuman facing the cine camera, the level restores, goes into default viewport, BP_actor disappears from outliner and from scene. I have to manually click to My Level Sequence and drag it onto scene again. It also happens when I start to Simulate scene. It is not by design, I hope? How to solve the problem and use save option without fear? Like in maya or 3dsmax.