Bug with dwarfen earth priests?

[kongxinga]

Hi great game here, still play it sometimes after all these years after the free release.

Has anyone noticed that dwarves dont seem to get ruby income, which earth priests need to summon all the good stuff like elemental lords? I captured plenty of mines that indicate that they provide ruby income, as well as holding plenty of towns that provide a few, but my ruby stock remains perpetually zero.
So no cool elementals or giants for my kitten murdering alcoholic kingdom, who apparently ride worms like certain natives on a desert planet.

Am I doing something wrong, or is this a bug? I know there is little to no chance for ewer versions of COE 2, but with the patching record of dom, who knows?