When I try to join my vanilla multiplayer server, my game output log shows hundreds of "warn" errors per second that all say "Received invalid biome id: -1". Every few seconds I get a huge FPS lag spike that makes the game unplayable.
If I play on the server and then on singleplayer, the lag spikes persist.
If I play on singleplayer without playing multiplayer, the issue is no there.
None of my friends on this server are experiencing lag spikes.
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We're tracking this issue in MC-197616, so this ticket is being resolved and linked as a duplicate.
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