I don’t have much expirience but I had alot of problems with timelines not working.’
The DoOnce was put there so I could make sure, in case the timeline doesn’t start, the Collision Type wouldn’t be changed, but I didn’t want the timeline in case it works to set the collision type multiple times.
With the DoOnce, if the timeline worked, the collisiontype would be changed once.
Also, I found the problem. In the same Ball_Pawn Blueprint was another timeline ticking, changing the color in another way. I actually set up a stop in case of a powerup but forgot it completely. Explains why it somewhat worked but didn’t change color.
Hope I didn’t waste much of your time. Coming back here removing the DoOnce made me realize it, so thanks!