After crashing into a wall, you can then jump in a 2 block high passageway and glitch into the roof (just for a second) before falling back down like normal, and if the bottom block of a wall (no matter how high it is) is missing you can also walk into it as if the wall didn't exist. (you will suffocate though)

I have seen a report about this that wass in 1.16, but after another search I couldn't find it anymore.