Affects Version/s: Minecraft 18w09a, Minecraft 18w10b, Minecraft 18w10c, Minecraft 18w10d, Minecraft 18w11a, Minecraft 18w14a, Minecraft 18w14b, Minecraft 18w15a, Minecraft 18w16a, Minecraft 18w19b, Minecraft 18w20c, Minecraft 18w21b, Minecraft 18w22a, Minecraft 18w22c, Minecraft 1.13-pre1, Minecraft 1.13-pre2
Fix Version/s: Minecraft 1.13-pre4
Java 1.8.0_25 64bits
Intel Core i5 6600K
NVIDIA GTX 960
Since 17w47a, blue wither heads can fly away through blocks on the first tick(s?). When looking at the first screenshots provided, we can think that the two neighbouring wither skulls are close enough to the edge of the 3x3x1 bedrock surface to shoot blue wither heads away from the surface. But in fact, those blue wither heads are just going through blocks. When looking at the next screenshots, you can notice that the wither can shoot projectiles underneath the 3x3x1 surface. This wasn't the case before 17w47a.
Steps to reproduce:
- Build a 3x3x1 bedrock/barrier area
- Put a fence 2 blocks underneath the middle block of the 3x3x1 surface
- Put an obsidian block 1 block higher from the middle block of the 3x3x1 surface (or a normal block but don't forget the water on the wither main head to prevent it from blowing it up)
- Spawn a wither on the fence (horizontally)
- Place blocks around the 3x3x1 surface and hit the wither with projectiles (snowballs)
I've provided screenshots and a world download to help people reproduce this bug .