Hostile Mob AI problems in 1.10 -Global problem for everyone!

Hostile Mobs without a bow ( zombies as example ) have pathfinding problems. Zombies don't even think about using the stairs and get to the players. Instead they walk on Iron bars or other blocks(also full blocks like dirt or stone,...).This bug was experienced for all versions of 1.9 ,1.10 and higher.Please fix it in Minecraft 1.11
The video is saying everything.
-Sneaking on edges is causing this problem!
Do me a favor and fix it

VIDEO EVIDENCE:
https://www.youtube.com/watch?v=cC4NPf4d3Zs