@MartenZander @CableJack Interestingly, I just ran into the same issue as you for the first time, where the two commands failed to bring up the debug visualization. It manifested after I had made some changes in a State of the character’s State Machine (added a Blend Poses by bool Node to switch between two different Blendspaces).
After closing and re-opening Unreal, the first attempt to paste in both commands at the same time again did nothing (I had pasted the commands when the Command window showed as a single line at the bottom of the Play in New Editor Window session). However, after I maximized the Play in New Editor Window session, the Command window changes to a center-aligned box, and then pasting in both commands at once worked (under normal circumstances, either Command view should work).
At any rate, the fact that the debug sometimes disappears must indeed be a bug that is triggered by editing the Animation Blueprint containing the Control Rig. 