Im aware it was seasonal and limited pick up time. But the quest was in his inventory ive just never heard of it being deleted straight out of your quest tab.

Again, that’s because it was seasonal and limited to only a few weeks, it dosent matter if you only just picked it up, it had a set date that it finished on so it disappears

I was honestly just unsure cause I've sorted out everything that is seasonally expired long before season end. A friend who was off destiny in season 10 wasn't sure what happened.