MULTIPLAYER BUG

CHANGE LEVEL.DAT FILE TO CREATIVE NOW WHEN MY FRIEND PLAYS WITH ME THE WORLD WILL CAUSE A LOT OF GLITCH
THEN IN SURVIVAL WHEN MY FRIEND FALLS HE WILL DRAMATICALLY LOSING LIVES TILL DEAD
P.S I DO NOT KNOW WHAT SEED I'M USING
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PLEASE LET ME KNOW IF YOU FIND SOLUTIONS