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.
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I believe this bug describes the same or a similar issue to MCPE-31389, except that in more recent versions of the game the foot of the bed becomes invisible rather than showing as half of a bed.
I am afraid we can not reproduce this bug in the recent version. Please update affected versions if this bug still occurs.