I had keep Inventory and i lost my fishing rod when i died in afk fishing (afk fishing is a machine you make with redstone in survival and it lets you fish while afk)

What I expected to happen was...:
I was expecting to keep everything since i had keepinventory

What actually happened was...:
I lost my mending fishing rod

Steps to Reproduce:
1. I dont know. it only happened once.
2. ...
3. ...