When casting a fishing rod while aiming upwards the bobber travels REALLY far.
AFAIK this was not a thing in older versions of Minecraft Java Edition (I am unsure when this changed)

Steps to reproduce:
1. Get a fishing rod
2. Aim upwards (-90 pitch for the best effect)
3. Cast the fishing rod
4. See a fishing bobber that is really far

The attachment video is filmed on a Minecraft server and the client has some QoL mods however I also tested this on 1.21.4 vanilla in singleplayer and still had the same results.