First spawning in, it appears that clouds can be seen through any block. Ive reloaded my game and world, and even tried loading a backup. This is what it looked like after all that:
MC-188801
Clouds Can Be Seen Through Any Block
Resolved
Duplicate
0
Dynetro Podhirny
(Unassigned)
Unconfirmed
(Unassigned)
1.16 Pre-release 4
Retrieved
Duplicate of MC-188669.