Minecraft wiki entry for Development_versions, associated text: MC-91364 – Mob loot cannot be specified for small magma cube and big/medium slime.
MC-176621 – Entity spawn packets use integers for yaw and pitch instead of bytes.
MC-207289 – Sculk sensor wool occlusion has directional bias.
MC-207522 – Sculk sensors don't react to horses kicking.
MC-207635 – Sculk sensors react differently to wool occlusion depending on the global direction.
MC-209905 – Sculk sensors are not activated upon milking entities.
MC-228533 – Sculk sensors don't detect the feeding of untamed/trusting mobs.