Several guild members and I have all encountered this several times. Go into the overcharged delve, there’s a purple “treasure”, but we can’t loot it because of an error:
“You have an unselected choice already. Please select a choice to open a new one”. I’ve tried reloading. There’s nothing waiting to be chosen. Its the first bit of treasure I’ve encountered, and apparently any additional ones will have the same message.
Taking my new belt off doesn’t do anything. Selecting a different option on the belt doesn’t do anything.