Villagers and mobs

So I have found a couple issues since the release of 1.1.16.100. Starting with Villagers, half of them are invisible. They will come back to where I can see them and then I won't be able to again, when they're invisible I can't interact with them, see them in bed. Also, my Villagers are sleeping on floors, in walls, will start floating through walls while they're asleep. This is a major problem because if I can't interact with my Villagers I can't sell/buy anything!

Next, with mobs. I have 2 mob grinders, set up the same way, one zombie, one skeleton. When more than 10 of either mob is in the 1 block hole they all started teleporting around like endermen which is annoying. Please fix this!!!