i have a nether like custom dimension with their custom Stone as main filler block, Unfortunately Mobs ar not spawning on the custom stone, The stone uses Material:Stone
Issue comments
You can upload it somewhere else and mail it to us, you can find support email here: https://www.pylo.co/contact
I have checked and your custom mobs do indeed spawn in your dimension. I did not see guardians, however. I am not sure why this is happening and I was not able to find a reason or a fix for this.
My suggestion for vanilla mobs, for now, is to make a structure only containing this mob and set this structure to spawn in the dimension and it will spawn your mob with it. This is kinda hacky way, but it should work.
If I find a reason for vanilla mobs not spawning I will let you know. but it could be their spawn configuration that is causing this.
I have re-tried to see if it's true and Surprisingly they spawn???(but no guardian)
Also another thing I just FOUND is that my portal spawn on the Dimension's Roof (Bedrock rood) Including Dungeons of the dimension..., For Nether like dimension, I should choose GROUND or UNDERGROUND spawn?
I will attach an Image of the thing, look
Are you using custom biome or vanilla biome for the dimension biome?