When you build the contraption seen in the screenshot and stand at the empty point between all the other blocks you will sometimes get moved into the blocks on the left side and when you place a slab as block 2 (The place of that grass block where you clip in) and then crouch you will have an X-ray glitch. I don't know if this is already being tracked, but I searched for it sorry if this is not clear enough.

Steps to reproduce:

• Build a 3x3x3 chamber that is two blocks tall out of any block
• Hollow out the chamber in the middle
• Place two pistons behind one of the four walls you can see from inside the chamber
• Replace one of the wall blocks with a lever/button that connects to the piston
• Press/pull the button/lever

View the image down here for the setup I used.