Dyeing removes key design elements from equipment

The bug I'm reporting (at least I think it's a bug) is with dyeing. Specifically, the leather wristguards have metal studs in them that get completely removed if the gear is dyed, no matter what color.

This is not a case where the pattern looks less discernible because of the dye color, but the studs completely disappear which is why I think this is a bug.

Time: Always
Frequency: Every time it's done
World name: Tonberry
Character name: Azullo Winterclaw
NPC name: n/a
Monster name: n/a
Class/Level: n/a
Party or solo: n/a
In-game time: n/a
Area and coordinates: n/a
Steps:
1. Buy or craft a leather wristguard.
2. Check that it's brown with silver studs on it.
3. Dye, or just preview other colors from the dye interface.
4. Note that with anything other than terebinth (the original color), the studs have completely vanished.

Here are two screenshots to illustrate the issue:
Before: http://i.imgur.com/xwxLzPh.jpg

After: http://i.imgur.com/6lWcacE.jpg