The new noise caves sometimes generate extremely tight corridors so tight they get cut off, creating small rooms that are impossible to find without spectator mode.. This could be a big problem because it creates dark spots wher emobs can spawn but never be found. It would fill up the mob cap and players wouldn't be able to find them easily to light hem up. Example in attachments. Seed is 4175698814037373607 for reproduction.
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@Tokes Yes the old carves make caves with no connection to others, but those are a lot bigger than just an 1x2 air gap in the middle of nowhere.
But...the old carvers do too. Since when is this considered a problem? I remember as far back as 2012 knowing if a cave dead-ends you sometimes just have to break thru the wall to reveal more cave (only works about a quarter of the time or less though).