Partner Quest Glitch

It's happened to me a few times as well with a few quests that were supposed to be Shadow Mission runs. I theorized to myself it might of happened because I was speedclicking through dialogue I've already seen before, and exited the conversation before the owl could fly by. So I waited for the owl to actually deliver the quest scroll and I haven't gotten glitched like this since. However this doesn't proved anything until I, or someone else willing to give up a quest for a day, consciously speedclicks on purpose in order to replicate the glitch.