When breaking the block with pressure plate on top (NOT the pressure plate) you will notice that the anvil, sand or gravel above it does not fall down. (See photo attached.)
A block update happens when you break either the pressure plate or the block beneath it. It is expected that the block above should fall in both situations. Here's an example: If I were to now place a block beneath with a torch on it, then break the block that the torch is on, the block above will fall instead of staying in mid air.
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This might be because gravity-affected blocks look for air under them when first placed, and look for block updates underneath them after they have verified that the block under them is not air. Breaking a pressure plate by removing the block it is attached to doesn't count as a full block update, so it won't make them fall. I'm unsure whether this is really a bug or if it's just a 'side-effect' of the way gravity-affected blocks work.
This might be because gravity-affected blocks look for air under them when first placed, and look for block updates underneath them after they have verified that the block under them is not air. Breaking a pressure plate by removing the block it is attached to doesn't count as a full block update, so it won't make them fall. I'm unsure whether this is really a bug or if it's just a 'side-effect' of the way gravity-affected blocks work.
Also duplicate of MCPE-11456 😉