in the nether, i was eating while on fire, and quickly switched to my OP sword while taking damage just when the eating animation ended.

my food ended up being duped in the slot where my sword was, and thus, my sword was no more.

this happened in a newly updated realm

i have not been succesful in reproducing this on purpose. all i can say is: this happens when on fire, taking fire damage + mob damage at around the same time WHILE eating and switching to another item.

HOPE THIS HELPS!!!!!