Not sure wich mod is at fault, so I open an issue for both.
With Inventorio installed relog will delete item in pouches. (both on server and single player)

On server, click on a stack in a pouch will throw one item at the time on the floor, works fine in single player.
Nothing seems to go in the log to help tho

PS, really happy you came back and update for 1.20.1 :) :)