The bobber casts, but the hook is still attached to the fishing rod. There is no fishing line, and no sound effect when you've caught a fish.
What I expected to happen was:
When I right click to fish, there is a casting sound effect, the hook detaches from the fishing-rod, and a bobber appears in the water. When a fish is "hooked" there is a sound effect alerting me to right click to catch it.
What actually happened was:
I right click to fish, hear 2 casting sounds, and a bobber appears in the water without a fishing line. When I see the bubbles get closer to the bobber, the bobber doesn't move, and nothing else happens. If I right click at just the right time, I can catch a fish.
Steps to reproduce:
1. Right click with fishing-rod toward water to cast it.
2. Observe no line attached to bobber and hook still attached to rod.
Addition by [Minecraft] Mega_Spud (Jay Wells)
The problem affects connected clients playing a multiplayer game including LAN games, not just realms.
Used description from duplicate ticket