Clouds switch from 2D to 3D repeatedly.

When playing Minecraft, I notice clouds switch around from looking 3D with height, to 2D, which looks flat. This gives the clouds a flickering effect. I have seen it happen on my two PCs which have completely different specifications. I noticed when moving, the clouds switching looks happens more often.

Expected:
Clouds having a 3D look (with height), or at least 2D if hardware is not powerful enough.

What happens:
Clouds constantly flicker from 2D to 3D looks, then back to 3D.

How to reproduce bug:
Play Minecraft in the Overworld (not the Nether or The End).
Watch clouds.

I searched for this, but it seems I may be the only one to report it. Sorry if this actually is a duplicate.

EDIT: Again, this happens on both of my PCs. They both are running vanilla Minecraft, no mods whatsoever.