When upgrading a world to 20w22a from 20w21a, there are world generation discontinuities. Feature generation such as trees and giant mushrooms are stopped along chunk boundaries. These issues also happen when reloading a world on some occasions in 20w22a.
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Nope, the seed is fine. The shape of the terrain hasn't changed, only chunk decoration, so I don't think this is a seed related issue.
Did the world seed reset to 0? You can check using
/seed
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