The wither boss can break piston extensions and end gateways. For both blocks it displays the missing texture (purple and black) breaking particles.
- Summon a wither
- Place an affected block in the area in the wither can break
- Punch the wither to make it break the block
Add piston_extension and end_gateway to net.minecraft.entity.boss.EntityWither.canDestroyBlock(Block blockIn).