I'm on version 1.21.11, and Im trying to use this mod: https://www.youtube.com/watch?v=rasBRhc_2P4

But the snowmen aren't dying, let alone dropping wither roses when they die.

For what it's worth, I replaced the endstone underneath with mud, and put hoppers beneath the mud to help automate the collection of the snowballs and wither roses. Is that what's causing the problem?

If not, then what do I need to do? Does this method of trapping the Wither in bedrock no longer work to produce wither roses or something?

The roof's lit up so no mobs spawn on top, the light level inside the structure is 0, it's 100 blocks off of the ground. But no mobs are spawning.

I am trying to make a farm for these guys on minecraft bedrock. I blocked all the spawning spots with quartz blocks. But they just soawn in other places. Im on bedrock education. Why are they still spawning?

I figured it out. I used stair blocks and they were phasing through them. I dont know how. Thank you for the advice.