Kagouti disappearing act
When next to the player in first-person mode, the kagouti partially disappears, and arrows shot at point-blank range pass through the kagouti without striking it.
Corpses keep moving
-Betty Netch (keeps "breathing")
-Bull Netch (keeps "breathing")
-Kwama Warrior (antennae keep moving)
-Shalk (antennae keep moving)
Miscellaneous glitches
-Kwama Forager corpses always slowly sink through the ground
-Dreugh are spawned half underground (stuck with only upper body visible) about 1/4 of the time
Can't loot arrows from corpses
-Betty Netch (arrows disappear)
-Bull Netch (arrows disappear)
-Nix Hound (arrows disappear)
-Kwama Forager/Worker/Warrior (arrows bounce off creature)

#1
Seen this. Not sure what's the problem here - bounding box on kagouti skeleton looks big enough.
This could happen with vanilla creatures too, depending on surrounding terrain. I didn't notice this with netches though.
Seen this too. Not sure how to fix, apart from replacing forager altogether.
Don't know why this could happen. Maybe underwater creatures spawn differently from ususal ones.
AFAIK, arrow loot chance is dependant on global game settings, and not individual creatures. Are you sure you weren't just being unlucky?