Whenever wearing Elytra, you can most of the time walk straight through head-height blocks and then begin suffocating due to you being inside the block. This is present when either wherein elytra and flying or walking and especially when you have the "levitation" effect in the end cities. This is really annoying due to the use of Elytra around my realm and that you can just bug out while building and it seems a bit cheaty to just walk through blocks.