Pillagers not spawning at outpost, guardians not spawning in monuments, mob heads twitching

Tried out the new snapshot and have noticed that there are no pillagers spawning at the outpost. The smaller guardians (not the elder guardians) are also not spawning around monuments. The head of mobs (creepers, spiders, passive animals) move erratically and from side to side or up and down when you approach them to feed them (such as cows, sheep and pigs) or when they approach (such as creepers, spiders) this doesn't seem to happen with zombies or skeletons. Chest under or in water won't open with first click, you have to either click and wait or keep clicking until it opens.