Yes!I can't reproduce the problems you mentioned with walking diagonally. I even modified E. Prime to have a slope there, but no matter how hard I try: I can't get the glitch. I think we are to blame that to network lag. (We might be able to counteract this by making /spawnobjects more intelligent and also run some code client-side to spawn objects that are missing only for clients.)

Then, I decided to set E. Prime underwater and try shooting diagonally. This indeed caused trouble even at the first try. It's definitely something we need to fix.