This is still happening however reproducing is somewhat unstable. It seems to happen more often on bedrock server if you stand on either a block in the "air" like a bridge or a trapdoor. Sometimes it results in just falling through the block, other times it seems the server over compensate and move you way up and even seems to be sideways. My guess is that the client loads the player entity and then the world gets loaded. The entity falls, server tries to verify but maybe the first packet gets lost or delayed, the server then tries to compensate for an entity that is inside a block and it gets it wrong.
I've seen similar with npcs spawning up on double fences, like named villagers. This also seems to result in npcs glitching through walls when a player enters the game and npcs are loaded and updated.
Pat Johns
This is still happening however reproducing is somewhat unstable.
It seems to happen more often on bedrock server if you stand on either a block in the "air" like a bridge or a trapdoor. Sometimes it results in just falling through the block, other times it seems the server over compensate and move you way up and even seems to be sideways.
My guess is that the client loads the player entity and then the world gets loaded. The entity falls, server tries to verify but maybe the first packet gets lost or delayed, the server then tries to compensate for an entity that is inside a block and it gets it wrong.
I've seen similar with npcs spawning up on double fences, like named villagers. This also seems to result in npcs glitching through walls when a player enters the game and npcs are loaded and updated.