Recently my bedrock mob farms have been broken. I built a creeper farm, but the creepers are not spawning. I talked to someone else with the same build, and he is also having the same problem. I also built a slime farm, but the slimes are not spawning either. This happened in a recent update - the one that changed how achievements looked- The tutorial: https://youtu.be/BQ3yGapdt-w
I hope this can be resolved.
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If your sim distance is 6 or higher, the spawning methods has been changed. its 24 to 128 in sim distance 6 and higher. In sim distance 4 its 24 to 44.

That creeper farm design uses buttons to get creepers to fall. That no longer works due to other bug fixes; see MCPE-99698.

That creeper farm design uses buttons to get creepers to fall. That no longer works due to other bug fixes; see MCPE-99698.
If your sim distance is 6 or higher, the spawning methods has been changed. its 24 to 128 in sim distance 6 and higher. In sim distance 4 its 24 to 44.