Minecraft 25w19a
A much smaller snapshot this time. See the changelog.
Happy Ghast
When the Happy Ghast detects a player on top of itself, it will wait 5 ticks before checking for players again. If it does not detect a player on top of itself after 5 more ticks, the Happy Ghast will start to move again. This behavior is implemented by the still_timeout NBT integer field, a value counting down from 10 to 0.
Entities
Transformed entities now copy their CustomNameVisible NBT even if no CustomName is set.