There are too many bugs in Minecraft beta 1.15.0.51! I saw these bugs in my main survival world:

There is a fire on a grass block near my house that is always burning and rain couldn't turn it off.

I have a boat. When an entity is in a boat, it will cause a huge shadow in the water; and when I'm in first person mode and I'm riding the boat, when I try to turn my head to left (maximum rotation) The items in my hand start glitching!

Sometimes when I'm going to nether or coming back from there, the building terrain page will not get off my screen but I can hear taking damage from being attacked by mobs; and when the page get off the screen, some parts of the world couldn't load.

 When I save the game and I try to load it, my location will change 1 or 2 blocks away from my saved data place.

When I equip a shield and I sneak, it will block attacks but it will not be shown in front of me (third person front and back and other person's camera).

I will attach some of the bugs screenshots. I'm using a Lenovo tab4 10. Please fix these bugs. Thanks!