If you are currently holding any item (with durability or without) when armor breaks, the item selected will "break" as well and be lost.
Linked issues
is duplicated by 40
Comments 12
Ah that's why my sword disappeared.
Some time during beta, I remember having some tools break randomly, is this somehow linked?
We know. If you were to, perhaps, glance up at the header of this ticket, you might realize that the issue is fixed for a future version, not 13w19a. There is nothing Mojang can do about bugs already in a released version.
This must be what is happening! I reported the issue being as my sword randomly breaking, but if your post is true this explains it. Someone needs to confirm this and fix it.