Few times did this, and the rod (and likely the whole world) glitched, couldn't pull the line at all. Even dropping the rod doesn't help. Tried to restart the world, and after pressing "Save and Quit to Title" the game hangs and crashes.
Linked issues
Comments 7
this kinda relates to my report MC-109256.
Yeah, @unknown's issue is pretty the same. But in my case it lags only when casting vertically down.
Your issue is very difficult to understand, and because you cannot upload a video or a like that shows this issue, it'll be closed as incomplete, until such thing is attached.
Could you attach a video (link) showing this issue?