Respawn window is acting strange

I was in a superflat world and I went into survival mode to test out the crafting table bug (I'm sure you've gotten plenty of reports on that) and I tried it and you can't craft a crafting table so I started to fool around and got killed by slimes and I noticed how the slimes were jumping frame by frame instead of jumping in their normal animation. I'm not sure if this is just me or everyone I just wanted to point it out.