[2023] Spellblade offhand vanished on new patch

if an item is forced un-equipped, it should follow a series of locations it tries to go.

1.) It goes into your inventory
2.) If no space in inventory, it goes into Gift inventory
3.) If no space in either above option, it appears on the ground.

Try checking these locations, along with checking the Forge (just to see if it might have been left there).