Bukkit

What steps will reproduce the problem?
1. For example. '/disguise player Cat
2./disguise player Dog
3.

What is the expected output? What do you see instead?
Expected output is to become a player named 'Dog, cat, etc...' Whatever the mob name is. The output is instead becoming a player named ocelot, or wolf. Ex. doing '/disguise player' Cat would then make you a player named ocelot instead.

What version of the product are you using?
v 4.9

Do you have an error log of what happened?
I do not believe it is needed.

Please provide any additional information below.
I only tested this with the names Cat and Dog, I do not know what other mobs/names this could affect.

Ah nice catch.
The string substitution system has an issue XD