[Object] Alliance being able to mine in Garrison Armory

[Daribon]

Current behavior:
Alliance players are currently able to mine in Garrison Armory in Blasted Lands. (Nethergarde mine)
Expected behavior:
Alliance players shouldn't be able to mine Garrison Armory, only horde players should be able to do it. It shouldn't show anything when you hover over it as alliance.
Blue posts from 2008: https://blue.mmo-champion.com/topic/75178-mining-in-blasted-lands-garrison-armory/
You can also check this on classic, it's the same there.
Here is an image from classic, when an alliance player tries to mine it:

Here are the following objects affected:
https://classic.wowhead.com/object=150079/mithril-deposit
https://classic.wowhead.com/object=150082/small-thorium-vein

According to sniffs, the faction of the objects should be 102, I've tried setting the objects to that but to no effect.
Faction 102 according to factiontemplate.dbc 1.12.1 should be friendly to horde (4) and enemy to alliance (2).
I wonder if it's possible that the faction check is broken for objects.
Steps to reproduce:

1. Go into Garrison Armory as alliance.
2. Hover over any vein.
3. Go mine it.

Client version:
1.12.1.5875
Commit hash:
a9a969f
Operating system:
Windows 10