Confirmed in Xbox One edition, both in local and Realms maps.
This is using quick move, as you can't place items in the chest when it is full otherwise. You don't need to be riding, just have the mule inventory window up. Items from your expanded inventory or quick use inventory are lost upon using quick move to a full mule chest.
Killing the mule doesn't drop the lost items. They are instantly and permanently gone upon using quick move.
Confirmed in Xbox One edition, both in local and Realms maps.
This is using quick move, as you can't place items in the chest when it is full otherwise. You don't need to be riding, just have the mule inventory window up. Items from your expanded inventory or quick use inventory are lost upon using quick move to a full mule chest.
Killing the mule doesn't drop the lost items. They are instantly and permanently gone upon using quick move.
I forgot to mention, killing the mule doesn't retrieve the lost items.