Mobs occasionally become stuck on the carpet block while moving, simply jumping in place.
Mob jumping bug.
Animals Jump weirdly on carpets
Mobs jumps nonstop while walking on carpets
Horses jumping on carpets
Cows jump up and down on carpet and pigs don't move
ocelots go crazy on carpet
mobs always jumping on carpet
mobs will rapidly jump on carpets
Snow (cover) makes mobs jump but do not move
Mobs can't go from a carpet to an upper block