Using the light blocks only obtainable via command blocks / commands you can create some weird errors. by placing a light block beside any block and then crouching so that you're basically sitting off the block but are still on it, you can create an invisible ice slide. not only that, but the light block also acts like a non movable block, meaning that it blocks any piston builds if too many light blocks are above a piston. I made a big tower parkour and then put a bunch of light blocks in it using commands so that it could be played at night and all I got was a bunch of messups due to crouching too far over a block and obtaining ice physics. This is really bugging me and I would love it sooo much if it was fixed.