After an extended period of time, some blocks or items will become invisible.

After an extended period of time without playing a specific Minecraft world, some blocks or items will become invisible or unworkable until it gets updated.
Also, in the screenshot, the bed does not work when you right click it. :/

Also, I have no idea how to make a proper screenshot in this version of this game. There really needs to be a button for it if it is necessary.