I updated my game to the new update, made a copy of one of my worlds and updated it to have the new caves. Here's a list of the bugs I found in the span of about 10 minutes:

-Friend joined, couldn't see him or his nametag
-Couldn't see half the mobs
-Couldn't spawn mobs
-Night vision potion (drinkable version) wasn't working
-Fireworks not working
-Permanently sprinting
-Unable to sprint
-Delayed sprinting
(Switched to survival mode, friend left the game)
-Couldn't take damage from falling or lava
-Took damage for no reason whatsoever, didn't stop even after multiple respawns
-Died after a 3 or 4 block height while at full hearts
-Couldn't break certain blocks
-Mobs randomly showed up from a distance and disappeared as I got closer
-Couldn't enter the nether or the end
-Couldn't hit mobs
-Couldn't sleep
-Time cycle randomly went backwards about 10 seconds every 20 seconds or so
-Delayed inventory opening
-Can phase through floating blocks (that are at face level)

I apologize for not getting any screenshots or video