[BUG] Mining specialization: Illimited Diamond drop chance

Good day to everyone!

Couldn’t find a similar topic.
Reporting a potential bug:
Mining specialization: Metallurgy → Surveying → Last perk(Chance for getting illimited Diamond from rich veins).
I am pretty sure that this is bugged, since i got 0 for the past 6-7 days of active mining( yes, I have nothing better to do in the game xD)
*Also have seen similar comments on wowhead.

According this comment on WoWhead they can drop from other nodes besides “Rich” ones and that the drop chance is just very tiny. So it doesn’t appear to me that it’s a bug.

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