So I checked what I could find… The “Event On Child Grip Release” in the DoorBP is called immediately after everything connected to “Event On Child Grip” has finished. However, on the PawnCharacter side, no InputAction(Release) is called - so it seems that the Grip Release is spontaneous (or maybe caused by something else, like the controller location being temporarily updated?).
Any clues what to do next?
Edit A new hint! It turns out that Teleporting is somehow triggering the behavior. If I’m starting close enough try the door without having to teleport, there is no issue. If I use any of the other movement modes, there is also no issue! Even with the “Navigation” mode and “Out of body Navigation” there is no issue. So whatever value is out of place, Teleporting sets it, while the others don’t.
Edit The cause is somewhere in the function “Perform Move Action Teleport”. As soon as I take that function out of the BP, the problem disappears.