I expected the mobs to not walk into walls and die, but they did.
To reproduce just:
1. Place water
2. Place sign in source
3. Watch water magically stay
Environment
I have 64 bit java, windows 8, nice computer etc. This shouldn't matter because me and my friends have experienced the bug. They are affected too.
18th Duplicate of MC-5770, please use the search function to see if your bug has already been submitted. Currently over 52% of tickets are being closed as duplicate.