While the player is under the effects of Blindness or Darkness, block outlines remain visible through beacon and end gateway beams. This issue only affects translucent blocks. As of snapshot 25w16a, entities and particles are no longer affected and do not render through the beams.
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Definitely not a duplicate, because that issue does not require the player to have Blindness/Darkness, and happens only on certain angles.
Can confirm, affects banners, clouds, translucent blocks, but couldn't reproduce with entities. They all just render black.
Judging by the screenshots, seems to affect clouds and transparent blocks?
Might relate or duplicate MC-188151.