Random things are disappearing from my world and it sometimes glitches for no reason.

So I've been working on my first world for a couple months now, I've created elevators down to my house so transporting animals isn't super easy. I got them all into their assigned spaces I made and have been using it just fine. Then I updated my game and after my third time of loading into the game al of my animals were gone. They were just completely gone. 

The second world I made was on Thursday and I had been working nonstop on it for days now, then yesterday I was trying to get a large amount of villagers, I had managed to round up over 20 of them. I was moving one of the villagers around in a boat and then once I got out of the boat the boat was still in the original place and I was standing where I brought the boat, but when I got out of the boat it hadn't moved? The best way I can explain it was I started at point A with the boat and Villager, I moved to point B, I think got out of the boat at point B but once I got out it showed the boat and villager both still at point A. So I exited out of the game and loaded back in and the boat was gone, all the mine-carts I had placed were gone and every single villager I had rounded up was gone. Basically losing days of progress and it's really frustrating.

Just loaded a new world cause I saw Minecraft had a bug update and wanted to give it another try and traveled over 1000+ blocks to have my boat disappear as soon as I got out of it.