Actor (blueprint) with strange material behaviour. Only during Play session.

Actor (blueprint) with strange material behaviour.


Good afternoon.

I have a problem I can’t solve: Only when I take over the subject (Play session), I have materials (doesn’t matter which ones) behaving very strangely. It doesn’t matter what the setting is: whether it’s compiled as Nanite or not, the material type, whether I compile with LOD … Only the selected and active subject I have this behaviour.
If I run it as a simulation or watch the actor without the subjective camera, everything is OK.
Even the same actor, with the same materials placed in the scene as a non-active Mesh, all OK.

I don’t know what to do anymore.