Whenever I summon a zombie with a spawn event it would make it move too fast and not even execute the spawn event in the command.
For example, I executed this command in my old world "/summon zombie ~~~ minecraft:as_baby", it just spawns a adult zombie that moves too fast than it's normal speed but when I execute this command on another world or remove addons from the wrold it works perfectly fine.
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We're tracking this issue in MCPE-50328, so this ticket is being resolved and linked as a duplicate.
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