Hi, there is a bug in my singleplayer world.
ex. 1. When i place down an item frame and put in an item in it, and when i knock out the item, it just disappears, and the item frame too.
ex. 2. When i place down a boat and i knock it out, it just disappears, and this happens with minecart.

ex 3. When i place down a button and place a sand block 2 blocks above it, the sand falls down, and it disappears when it tocuhes the button. (this happens with red sand, dragon egg, dry concrete, gravel)
They are very annoying bugs.