Hello everyone. I will be glad if you help me solve the problem.
When I move a short distance away from the object, the mesh is no longer visible. This is a problem with any view mode except Path tracing.
Perhaps I configured something wrong, but the problem is both in my level and in ThirdPersonMap.
P.S. I don’t have permission to attach videos. Please watch my video from Google Drive 
Try Build => Build all levels. Perhaps something when wrong with your occlusion culling data.
I tried a lot, including this, but it didn’t help.
After 2 hours I solved the problem by cutting the Config folder from my project (Unreal Projects > myproject > Config) to the desktop (as a backup).
But I would also like not to close the topic and find out the cause of the problem
UPD:
Perhaps this bug is somehow related to Nanite. After resetting the config, new nanites were not shown correctly.
The command helped:
r.Raytracing.Shadows.EnableTwoSidedGeometry 0
I would check you bounds scale for static meshes. If set too low it might not register with the culling system (normally it is set to 1.0).
Here you can see the same problem with foliage where the cull settings are wrong.
You could also have a cull volume in you level
