I’ve had this issue many times now, but never consistently reproducible. Have any of you had the instance where you were trying to complete a puzzle and you hit spacebar to jump, but your character did not jump? Sometimes a run+jump is required to land on the next surface, and in these cases too I often find my character disobeys me and runs, falls, but does not jump. I’ve tried letting go of mouse buttons to get out of camera mode before jumping, and I’ve tried it with the camera mode on. It doesn’t seem to matter, there’s some kind of chance each time that the jump won’t execute. I’ve had it happen when I am standing still as well. Sticky spacebar? I don’t think this is the case. Slow network update (e.g. character already ran off the edge before I see them do it to time my jump)? No idea here.
Certainly adds a new and frustrating level of difficulty to puzzles.