The bug
Whenever you cast a fishing rod in water, every time the bobber moves up and down, excessive bubbles are created. Additionally, the subtitle "splashing" is shown, despite no audible sound heard.
This new behavior makes it harder to notice the particles that show when a fish has been caught, thus making fishing harder.
Note
None of this behavior is observed in 1.12.2, so this is probably a result of new water mechanics regarding entities. Bubbles are occasionally created in 1.12.2 when fishing, but to a much less extent.
Related issues
relates to
Attachments
Comments

Confirmed for 1.13-pre7
Confirmed for 1.13-pre8
Confirmed for 1.13
Confirmed for 18w30b

Hello,
I found some more particle fishind rod / fishing bugs.
1. sometimes, the particles, if a fish is comming, are under water or laterally offset.
2. the rod line is to fast, when the player sneaks. ("old" not smooth animation)
Confirmed for 18w31a
Confirmed for 18w32a
Confirmed for 18w33a
Confirmed for 1.13.1-pre1
Can confirm in 20w49a.
Can confirm in 21w03a.
Can confirm in 21w06a.
Can confirm in 1.16.5 and 21w08b.
This ticket is currently blocked by MC-219849.
Can confirm in 1.17.1.