Summary:
Sculk cannot appear when the mob dies on the Mud and Soul Sand. This problem arose after changing hitbox the Mud and Soul Sand blocks. When a mob dies on a complete block, a sculk can replace Mud and Soul Sand.
Steps to reproduce:
Create a platform of soul sand or mud.
Place a sculk catalyst on this platform.
Kill a mob near the catalyst.
Observed results:
Sculk cannot appear when the mob dies on the Mud and Soul Sand.
Expected results:
Sculk can appear when the mob dies on the Mud and Soul Sand.
Linked issues
Comments 2
This is not intentional. The Java version is proof of this. See MC-249262
It can also replace Mud and Soul Sand blocks when the mob is standing nearby on a full block.
i think that's intended. not all blocks can be converted after all.