After today's update on April the 6th for bedrock, the nether has a fog and the render distance is exponentially reduced. Prior to this update, the nether was void of fog and allowed for great distances to be viewed. This issue effects certain mega builds within the nether and does now allow me to see my projects from afar as I had prior.
Thank you for your report!
However, this issue has been closed as Working as Intended.
https://feedback.minecraft.net/hc/en-us/articles/360059426071-Minecraft-1-16-220-Bedrock-
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