Easilly repeatable -
If you que for a BG, accept the queue when it pops, and then target and NPC within pickpocket range, the queue will reset but you will not be dropped from the queue. All players will get the message that someone declined the queue and it will immdiately attempt to restart the ready check. Even if the group enters the "forming group" stage of matchmaking, you can reset the queue without getting dropped by picking a pocket (or failing to pick a pocket). You can repeat this process dozens of times before occasionally becoming character bugged and just permanently queued.
Speaking of Battleground queues, do you ever even read the battleground forum? There is a post there about how premades should not be in the same queue as pugs that has been hot enough to stay on the front page for 10 months!! It has a poll that indicates enough desire from the community to see this changed than would be required to pass a Constituional Ammendment! Nothing in the patch notes (again). Fixing the BG queues is no brainer - I hope that in the process of fixing the pickpocket que bug the team considers fixing the design bug too....
Edited by jediodyn_ESO on January 25, 2019 7:59PM