Despite the bugs with the currency collection that have somewhat been addressed, the questline in general is clunky in execution particularly for alts. I realized one of my alts doesn’t even have the quest, but I think it’s because I skipped wing 1 of LFR on that alt (I do higher difficulties on mains, so didn’t have this issue). So I’ve been killing bosses later in the raid but not getting currency or credit for them. I am speculating this info because I haven’t seen anything written but all other characters have received it in the first wing of LFR.
Additionally, in order to turn it in if you’re completing via LFR, if you realize later that you exited too early, you have to make a group with a friend and convert it to raid just to enter the raid to complete it. Granted, there are ways around these issues, but it just feels like it could be much smoother to complete. I made a group with an alt on my second account and converted it to a raid to turn it in more easily than inconvenience others or wait for a queue.
Edit: went back through and did LFR wing 1 on that alt even though I didn’t need anything from those bosses. The quest did drop from the first boss, then I had to wait for the NPC to run to the boss area from the beginning of the raid. It seems unclear for others as well because someone in wing 3 was asking why they weren’t getting the item/quest. I guess it’s more to follow a story of progression, but might not be clear what needs to be done.