I was just flying in search for a basalt delta and recognized that pretty much all my biomes changes. Warped Forests are now basalt deltas. Crimson Forests are now Soul Sand Valey and so forth. Which gives a super weird view with fog and mobs not matching the landscape.
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However, we are already tracking this issue, and this report is a Duplicate of MC-194273, which is a report that has not been resolved yet.
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