When I was trying to build a hotel in the nether I spawned in a crimson forest biome. Then I saw hoglins in the build so I put it on peaceful mode. But it was still there. So I decided to go back to the overworld. And a hoglin must have gotten through the portal because I saw a zoglin wandering about.
Thank you for your report!
We're actually already tracking the zoglin issue at MCPE-79480, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Hoglins existing in Peaceful mode is working as intended, see MCPE-74135
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