The bug
When in one certain Nether biome, an ambient sound from a different biome can play. Here are some examples with attached clips:
When the player is in a Warped Forest biome, you can constantly hear the Nether Wastes Ambience track playing, and the slightly quieter Warped Forest Ambience is hard to hear over it. (mis_amb1.mp4)
When the player is in a Warped Forest biome, sometimes the sound Crimson Forest Addition 1 can play. (mis_amb2.mp4)
Likely more that I haven't noticed
Looking at the Minecraft Wiki Ambience page https://minecraft.gamepedia.com/Ambience#Nether_ambience, I don't think any biome ambience should play in two different biomes, with some exceptions for the Basalt Deltas.
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Comments 3
I've been in the Warped Forest for a few minutes, maybe at least 2. And when I entered, I came directly from a bordering Nether Wastes or Basalt Deltas. No nearby Crimson Forest.
For how long have you been in the warped forest? To my knowledge it might take a bit of time for the new ambient sounds to kick in.