When on my Java realm, we teleported a friend over to help us work on a certain build, but when he teleported, blocks of a structure ~10 blocks away were instantly deleted. It also deleted a portion of another build about 50 blocks away. We are certain it was not a mob or a grief. The blocks simply vanished in front of us. Attached below is a screenshot of the affected building, versus an identical structure that is part of the same complex. So far this has been a one-time occurrence, but if it becomes more frequent, could be catastrophic.
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However, this issue is Invalid.
Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.
Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the creator of the plugin or resource pack.
If you have problems on large servers like Hypixel, please contact them first as they run modified server software.
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