There is a visual bug in the clouds where the wrong gray shadow appears. in version 1.20.2 Pre release 1 or at least I see it in that version, I have no idea if it also appears in the previous ones.
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We're tracking this issue in MC-248364, so this ticket is being resolved and linked as a duplicate.
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That would simply be the render distance fog affecting clouds, as it always has; a while ago (not too many updates ago) the fog was corrected to be more spherical than a straight line.