I submitted a ticket about this issue and they recommended that I post it on the forums.
I’m working for the Horologicus Shield collection, one of the items I received (while on my mesmer) was the invisible mushroom spore from the treasure mushroom. Once I got the item, it automatically unlocked it for the Wild Abandon collection (which I already had unlocked) for the warrior spec. I did take a screenshot when it happened and another today to show the GM it was unlocked for the warrior collection. The GM said it is a known issue but nothing could be done on their end. So, there’s my issue ( not sure if it’s been posted or not) and hopefully it’ll get fixed! (:
