I basically have my custom channels, like Player Channel. Everything is working fine, except this:
Actors and even decals that do not collide with the player when they are placed on the map, they collide when they are spawned at runtime.
Why something like this could happen?
Sounds like there are some inconsistencies in the spawned actors vs placed out actors.
Are you sure that the actors you place in the scene have the same collision preset & Collision settings as the one that is being spawned in runtime?
Link: Collision Filtering - Unreal Engine