Typically on first load into the game, I will experience that the zones + rares load but items for some do not.

I suspect this is a synchronisation issue—the window is building before the options are built? it's building the next rare before it can finish the items for the current?

More investigation required, other input <3 greatly appreciated!

This is because the Item Cache has not fully-populated on first load into the game.

Rewriting the Rare+Item writing to be dependent on Item:ContinueOnItemLoad() should fix this.

Fixed with a5faafd