Commented also in MC-236884, I am not sure, if you see comments for closed issues, but that issue is set to RESOLVED, but in 21w42a and 21w43a it is not, because ocean-types of single biome are generating as desert (warmer ocean types) or as cadaveric plains without animals (colder types of ocean) ...
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We're tracking this issue in MC-236884, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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That ticket was resolved as "Works As Intended", meaning that this behavior is considered intentional by the developers. This is still a duplicate of MC-236884.