I don't know why this one water block generated.
Version: 21w38a, 21w39a
Seed: 5427686171353417876
Coordinations: -254 -28 -0
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I am able to confirm this behavior though, I think this is a duplicate ofย MC-237671. I'm not too sure though so please correct me if I'm wrong. ๐
Thanks for the report! We're tracking this issue as MC-215139. Please leave any information you have in a comment on that report, as it will help the developers identify a potential cause of the issue ๐