World Quest rewards changing

Just dinged 80 on an alt. Went to complete a few WQs while I waited for BRD queue. Before the queue popped, the Isle of Dorn quest “Excavation Extravaganza” was going to reward a 564ilvl weapon.

Queue popped mid-quest. After I turned in the anniversary quest to kill the emperor, as well as the Originals quest, one of the caches rewarded me with a weapon that is 600ilvl.

After I returned to Isle of Dorn to finish the WQ, I noticed the reward had changed, from the weapon, to 819 gold.

“What’s the big deal? You already have a better weapon” some might say. And in this case, that’s true. However, on other characters, I have seen the rewards change when the initial item still would have been an upgrade.

Has anyone else noticed this? Was there something in the patch notes I missed about dynamic rewards from World Quests?