Been trying to round up all the iconics that go on the stash wall and found out the Psalm 11:6 doesn't always drop when you clear the mission. I had cleared it at the start of my playthrough and it didn't drop for me, was unaware of this till I did some google detective work and seems it's an rng drop, people have had to reload and do the mission over 10 times to get it to drop. Hopefully this can be looked at and changed as this is either a bug or just plain dumb.

That empty spot on the...

Iconic Psalm 11:6 not dropping when looting.