I own this Mash-up Pack and whenever I try to create or load this world, a generic "There was a problem loading this world" screen pops-up (with no error code). When I click ok, nothing happens and I have to restart Minecraft. I really love this World and I really want to play it. I haven't observed this issue with other Worlds so I don't know what the issue is. Perhaps the world is on a very old version? Please Fix.
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We're tracking this issue in MCPE-61368, so this ticket is being resolved and linked as a duplicate.
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