Bukkit

What steps will reproduce the problem?
1.If per example an archer buy a diamond sword with an external plugins like showcase.
2.If the player use mouse wheel, he can't hold the sword, but if in his inventory, he deplace the sword on the selected square, then he can hold it.
3.

What is the expected output? What do you see instead?
It should be block.

What version of the product are you using?
The last.

Do you have an error log of what happened?No

Please provide any additional information below.