Very simple to reproduce : find a Azure Bluet and just move the cross on it.
Now you see that the hitbox is wrongly placed.
Environment
Windows Vista 64bits
4GB DDR2
Java 7.0.51
MC-51048
False Hitbox for Azure Bluet
Resolved
Works As Intended
0
Works as intended. Plants are randomly shifted off-center for visual variation. The hitbox remains in the center of the block on which it is placed.