"Damage" option not working correctly

Summary The "Damage" option, used to set a mob's damage to something other than the mob it is based on (for example wolf) dows nothing. I have a mob based on the Wolf. I set the damage to 12, which theoretically should make the mob do 6 hearts per hit. However, the mob only does 2.5 hearts per hit, like the default damage of the wolf it is based on.

Steps to reproduce

1. Create a mob with a "Damage" value different from the mob it is based on.
2. Have the mob attack you.

Pastebins

https://pastebin.com/6UMA7Utk

Current behavior The mob deals the same amount of damage like the mob type it is based on. For example a mob based on a Wolf, would deal the same damage as a wolf

Intended correct behavior The mob would deal damage according to the "Damage" option.