Ver. 1.16.5-2.1.20
seemingly everything else that should drop from aquaculture does drop at what seems to be a normal rate. except neptunes bounty.
extensive testing via generating a chest with the following command : /setblock ~ ~ ~ minecraft:chest{LootTable:"gameplay/fishing"}
attached is a mods list
(no configs were changed)
apologies if this is my fault!
modlist.txt

It most likely won´t generate with that command, as it requires to be in "Open Water", as all vanilla treasure also do nowadays :)