Minecraft Fishing rod?

So just earlier I was using an AFK Minecraft fish farm and I was using a Luck of the sea III and Mending fishing rod, when it just randomly disappeared after like 3 minutes of using it. If anyone knows why this is happening or how to fix it that would be great. I’m playing online on Minecraft servers.

Could it be durability bug? Did I use it that quickly? That’s impossible, not to mention the fact that I didn’t get anything or much at least.