When using the nether to fast travel between two locations on the overworld, mob won't spawn in the overworld after teleporting to the destination. Returning to spawn enables back mob spawning. Said destination has no mob spawn problem when travelling only in the overworld.
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No i mean mobs aren't spawning once you go in the overworld through the second portal

The described behaviour cannot be reproduced on 1.15 Pre-release 1.
I think thats a feature since being in another dimension doesn't load the chunks of the overworld. Correct me if I'm wrong 😃