In snapshot 20w22a, there is a horrible bug which causes the clouds to 'freeze'. when I went to turn off clouds (having previously set them to fancy) they would stay on my screen - but when i looked around, they would stay in the exact position on my screen when i looked down, making the clouds look like they were vertical.
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However, we are already tracking this issue, and this report is a Duplicate of MC-186071.
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