Thanks, nice to be here 
Yep, on my other map, it works, too.
I had some Camera and Matinee Actor in my scene, but after deleting them, nothing changed.
For test purposes, I will implement another character and change the actor class of my blueprint. Maybe this helps - my hope is, something is interfering with the custom character and this will be the solution.
Thanks for the timer solution!
I knew a tick is expensive, but I didn’t know how to avoid them. Now I know. Thanks!