Description

Ice Thistle Matriarchs and Ice Thistle Patriarchs are also capable of dropping Thick Yeti Fur but do not indicate so. Wowhead does not indicate so either.
I've attached screenshots below as proof, of which I only covered up other peoples' names and messages in my chat.

Wowhead link

https://classic.wowhead.com/quest=3783/are-we-there-yeti
https://classic.wowhead.com/npc=7459/ice-thistle-matriarch
https://classic.wowhead.com/npc=7460/ice-thistle-patriarch

Screenshots

Questie version

v6.3.16 (Beta 9)

Fixed with 82ccab3