[REJECTED] Tailoring quest for Imbued Silkweave Bag/Return to Karazhan Bugged?

[Hildaron5]

WoW Freakz link:
Bug description: Ok so to be honest i don't really know why this happens but the problem is the following:
I got tailoring and wanted to get the recipe for Imbued silkweave bag and it's rank 1 is got from The big bag theory quest in karazhan but when i queue up and enter the dungeon people just leave it so I guess return to karazhan might be bugged? But the other problem is that one time i got lucky and we finished the dungeon and the last boss was supposed to drop one of the quest items and it didn't drop it. I've been stuck 5 days with the quest for the bag, checked how many people actually did it with .info but it says 0 people/0 bug reports and that couldn't be possible because there are people selling that bag on the AH. So yeah if the quest is bugged after 7.3.5 if you could fix it and fix return to karazhan cuz a lot of people are complaining about that too.
Proof:

[Swiftmend]

Rejected,

Items have a drop chance.
https://www.wowhead.com/item=142122/bag-of-a-thousand-pockets
https://www.wowhead.com/item=143548/fel-sinew-bag

And you can also see the drop chance of it on freakz:
https://www.wow-freakz.com/wowhead/735/?item=143548
https://www.wow-freakz.com/wowhead/735/?item=142122