Oooph… it’s a long one. Short story is that patch 11.0.2 disappeared a bunch of stuff from guild banks. Mostly crafting mats and not all people were affected, but some that were lost a lot more than that. Blizzard claimed they did a restore, but really just sent out a few stacks of junk to some people and called it good.
Start of a long thread: Guild Bank Missing Items Bug -- Aug/Sept 2024 (Part 1)
So yeah, ever since I pretty much stopped collecting anything unless it just falls in my lap.