It now occurs after "1.18.30" version update.
When the setting "Friendly Fire" is "ON", whenever you attack and damage the player, everyone will be disconnected after 15~30 seconds from the server and no one will be able to connect to the server for a while: about 30 minites.
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We're tracking this issue in MCPE-153593, so this ticket is being resolved and linked as a duplicate.
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