This is on the PS5.
I used the Command spell and told Flind to drop his weapon. It succeeded. There wasn't a graphic on the ground. I suspect this is because maybe the art asset doesn't exist? I also tried holding R3 to see it and didn't. Flind picked the weapon up on his very next turn and used it.
I did end up getting the weapon later... FROM HIS COLD DEAD HANDS. But thought I'd report this minor bug.