Hi all. First post, I just signed up to share this glitch; It's the same one @Asmodemus discusses a couple posts earlier. I managed to capture it with my PS4 and upload it. I'm still working on being able to reproduce it, but it seems like the glitch is triggered when you're falling off a platform and the game is trying to subtract from your Z coordinates while you simultaneously are jumping and adding to the Z coord.

The really interesting part is that unlike Asmodemus's experience, I was able to use this to create an infinite jump loop by hammering on the X button. The very slow sinking seems like it might be the game trying to run the code for the badge that prevents death falls, but alas I did not think to take the badge off and see if I could get more speed-run friendly descent speeds.

The glitch was eventually remedied by interacting with a chest. It does not, however, stop when you pick up yarn, badges, vault tickets, pon or health. I'm assuming that the 'fix' is in any cutscene where the game has an excuse to fix the player position to a certain coordinate and set values like x/y/z speed or Jumping/Doublejump to 0.

https://twitter.com/PKWorldDesign/status/1083553149191737344

I think being able to reproduce this might be the ticket to a viable and visually interesting 100% category.