You guys have probably seen this one many times. Sorry in advance for mentioning it again.

Essentially, the game seems to suspend itself, meaning that entities, dropped and usable items, and other in-game events cease to exist or do anything. I have found that Elytra movement also seems to stop working correctly - I have attached a short video of me moving around in my world using the weird Elytra movement.

Quick edit: I should note that, in the video, I was not holding forward at all