The farm is built according to this video:
https://youtu.be/hTAHK2XnpQs
It is not the first time that it had happened.
The first time it happened, it happened to a fresh new rod. But disappeared 2 mins later. It also happened to my brother on the same server
There is Mending, Luck of the Sea II, Lure II and Unbreaking III so there is no reason for it to break. Also not wearing any armor at the time of issue.
The farm is built according to this video:
https://youtu.be/hTAHK2XnpQs
It is not the first time that it had happened.
The first time it happened, it happened to a fresh new rod. But disappeared 2 mins later. It also happened to my brother on the same server