[WaT] The Thing In Wit’s Pocket

So Wit is vaporized by Retrivangian (trying this name on for size) and has his body turned into a red mist right? We saw Wit with that bone he uses to contact the dragon realm on Roshar. Then we see Wit again on Scadrial towards the end, and he contacts the dragon realm again with the bone.

Didn’t the bone get vaporized too? Why would it make sense for the bone to show up on Scadrial when all the matter for old Wit was destroyed along with clothing and presumably whatever was in his pocket, including that bone?