Custom mob spawns in nether

Status
Can not reproduce
Issue description

I made a custom entity to only spawn in my custom dimension but the mob also spawns in the nether.

I also made an advancement that only triggers when you go in the custom dimension but you also get it when you go into the nether.

so yes, my custom dimension seems to act the same as the nether

Issue comments

I did this:

  1. Imported your workspace
  2. Made new world
  3. Made nether portal and entered it
  4. I did not get advancement (at least not your custom one)
  5. I explored the nether a bit and did not found "Soul" entity (tried tp-ing all entites of type soul to me too with no avail)

Did I miss any steps?

ok I think the problem is with the does water vaporise checkmark.

because in the sample workspace i didn't put that I think.