I find a bug of generation in 20w46a
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Hey there!
Just to let you know, this issue has already been reported before and is a duplicate of MC-203636. This report ended up turning out as "Works As Intended" so it isn't actually a problem.
https://bugs.mojang.com/browse/MC-205907?focusedCommentId=842370&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-842370
MMK21, they attached a video. 🙂

MMK21, they attached a video.
Yes, that's the point. Attaching a screenshot and saying "Look, here's a bug" doesn't actually tell anyone what they're talking about.
Please don't just say 'this seems like a bug' and leave everyone else to figure out what the bug is.