Just found some disadvantages. “Spawn Actor” has no “No Collision Fail” option. That’s better for spawning AI, because it spawns also on collision problems. After changing to “spawn actor” to be able to use “Expose on Spawn” properties, I have no more errors on collision as before.
Back to topic… Somebody has a better idea how to use “Expose on Spawn” properties with “spawn AI from class”?