[Mining] Drop chance of Felslate Seam Sample seems too low

[Meanb0b]

WoW Freakz link: https://www.wow-freakz.com/item_finder.php?item=124497&&name=felslate-seam-sample
Bug description: According to wowhead, the sample should have a 5% drop chance from Felslate Seam (https://www.wowhead.com/object=255344/felslate-seam#mining). I have not completed the quest yet (see screenshot) - which is the sole loot condition of this item, but I have mined Felslate Seams for more than a week now for several hours a day and can't manage to get it dropped. Could you please check the drop chance of this item? It's a real pain to farm already and even more so with such a low drop rate. The other two Felslate samples dropped pretty quickly, but the last one doesn't.
Proof: https://imgur.com/a/CuIEebc

edit:
I just noticed that for some reason, Felslate Seam Sample doesn't even appear as possible loot from Felslate Seam. Most of the other items do have a link to where I can mine/loot them, but the sample and two Leystone upgrade items (Battered Mining Pick and Torn Journal Page) do not have a loot table either.

Honesty's an attribute of the truly brave - and thus a privilege to the very few.
- Regis Terzieff-Godefroy

[Coxman]

i have the same problem i can't have the seam deposit any one can bring some light to this ?

[Sahskar]

I can confirm this works, the drop rate is well within reach.. I ding'd mine 2 days ago and have been mining for about 2 weeks. My Leystone drops have been forthcoming too. Hang in there, they will drop.