In build#200,the unidentified equipments don't have the tier 'unidentified' , and they still have no tiers when identified...I don't know if this is a feature or a issue -.-

It's neither. It's part of how it's coded. The magic words in the lore is the tier name. It uses the tier color to color the name. Since the tier color of Unidentified is Magic, it prints as magic. We can make it so that it doesn't do that, however.

Fixed in most recent dev build.