USpecial behaves really strangely with the way pressing down to remove the umbrella functions. A big example of where this can be a problem is if you spam down and up repeatedly, you can stall yourself in the air for absolutely ridiculous amounts of time. You can also do something silly like what I recorded at 0.25x speed here[gfycat.com].

EDIT: I think I just found missing hitboxes on the jabs[gfycat.com].

The jab hurtbox missing is known, I just have been gone from my compter and unable to fix and will do so asap.

Cheese sometimes disappears and doesn't come back. pls fix

This can be caused if you're playing on custom stages due to how it all works. Either that or Cheese has yeeted him self off screen. You can bring him back by double tapping special or parrying to force him to follow you again.

-on custom stages when you move cheese (with nspecial) he wont stay where you leave him and on vanilla stages he does

-abyss rune buddy doesnt work and appears to be unfinished if i had to guess is that its outdated or something

-Cheese can't be told to stand in place on custom stages in order to ensure he doesn't go flying off screen on normal stages.

-Abyss rune buddy is outdated, as you can now use abyss runes with workshop characters without the buddy by pressing Control + R in versus mode. You can also just enable abyss runes in online matches through the match settings menu.