There is server glitch where when someone opens a shulker while standing on it causes other player's game to crash instantly

The player who opened the shulker is however is not affected by this glitch. This bug is been for so long since 1.14 and i guess it has to do something with server software of minecraft bedrock. This glitch doesn't occur in any realms (as far noticed). Patch included will be great along with not keeping server software still in alpha stage.