Can be seen when entering the nether, as well as when teleporting to unloaded chunks far away in the nether. Did not happen before.
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Duplicate of MC-55863
This is not a duplicate of MC-55863 because the behaviour is different.
MC-55863: rain falling in Nether. This can happen regardless of the sky.
This issue: Overworld sky in Nether. It is a new bug.
Why it's a new bug:
Before 20w06a, the Nether only had one biome. It is likely that the code assumed the biome was the Nether when entering the Nether (a correct assumption at the time) so it could render the sky colour correctly before loading any chunks.
When 20w06a released new Nether biomes, any assumptions about the Nether biome were broken, so it is likely that any such assumptions have been removed. Now the game assumes an Overworld sky in the Nether because it has no biome information.
A possible fix: load the Nether chunks around the portal before entering the Nether, not after. No more than four chunks would be needed. The game only needs the biome information to render the correct sky colour, so that's all that needs to be loaded; this means the blocks and entities in the chunks need not be preloaded.
Sometimes even rain appears in the nether when the chunks are unloaded, which seems very strange.