I had previously seen both my and other artificers' iron defenders in town areas. However, now as a druid, my character is able to see multiple copies of my wolf pet in quests. I believe the procedure to replicate (the bug and the wolf) is as simple as dismissing it (when it fails to exit) before restarting the same quest. If it has replicated, you will find your previous wolf where it was when you recalled. Interestingly, the imposter Xohams were only present on even numbered runs of the same quest.

Screenshots on even numbered runs: