There's a seam along the edges/corners of clouds from misalignment that wasn't present previously.
Left: 19w38b, Right: 19w39a
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Didn't occur in 19w38b so I assumed it was caused by recent render changes and only searched recent bugs, but appears to have existed previously. Duplicate of: https://bugs.mojang.com/browse/MC-7882

Can confirm for 20w51a.

Can confirm for 21w17a

Can confirm in 1.17.1.

Can confirm in 1.19.

Can confirm in 1.19.3.