Mushroom Field biomes are generating very small and often cover areas of ocean that aren't populated by the land mass itself.
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Just so you know, mushroom islands with those sizes were already able to generate like that on 1.17 (except the really tiny one).
You might also want to provide seed and coords, just in case, because i was able to find decent-sized islands on every mushroom field i located.
Thank you for your report!
We're tracking this issue in MC-236649, so this ticket is being resolved and linked as a duplicate.
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Relates to MC-236649.