Summary
After converting the world there are some chunks in the nether that surround the loaded area and can spawn overworld mobs. So far I've seen creepers, zombies, baby zombies, spiders (other players also have reported slimes to spawn in the nether).
Steps to reproduce
1 Create a new world on Minecraft Xbox one edition with the following setting and info
build 1.12.1783.0 7.0
peacefull
creative
seed: 12345
(rest of the settings are left to default)
2 Load the world and create a nether portal at 59,69,251
3 Enter the nether and wait a little while and rotate the camera to get all chunks loaded that surround the player.
4 Save and Exit
5 On Minecraft 1.2.8.0 (bedrock codebase) Import the world as usual.
6 Put the game on hard difficulty
7 Look around the edge of the area that was loaded in the previous version
8 Notice that overworld mobs spawn in certain chunks
9 If step 8 did not work run the kill entity command and retry 7/8
Expected
No overworld mobs to spawn in the nether
Linked issues
is duplicated by 2
Attachments
Comments 5
Might be related (see my bug report on double exit portal for end), but converted world where end was never generated, had overworld mobs on end island not enderman when went to kill ender dragon. Made a quick trip to end islands and that had the normal enderman spawn.
Logging out and back in today, still had overworld spawns on end island, so looks to be permanent.
I have a legacy console converted world, and as of bedrock 1.8.0(possibly earlier) even after loading in new 1.8.0 chunks, all overworld hostile mobs have been spawning in the nether. This includes Zombies, Spiders, sometimes a Witch, Creepers, and Slimes, alongside regular nether mobs.(Skeletons are supposed to spawn in the nether)I play using an xbox.
Have you tried converting the world again using the latest versions of the game, as the fix for the issue likely involved the actual world conversion process.
Sorry this is late but a workaround is to reset the Nether at the XB1 stage before converting to Bedrock...
I only noticed this recently as I have been converting a lot of my old catalogue of worlds and thought this info might be useful for people in 2020 wanting to convert their old stuff...
Its a useful bug actually because you are left with a choice to reset or not...having the overworld mobs left in sure is a challenge gauntlet feeling more akin to a modded world rather than vanilla...the choice, however, lies with the player....
HTH
Have also seen bats and witches. This happened on one of my transfered super flat testing worlds. Absolutely no nether mobs in the nether (didn't check a fortress).