When you right-click on Greenery's seagrass with a seagrass item in your main hand, the seagrass will emit breaking particles but remain, and it will also drop a new duped seagrass. (maintening right click will basically generate infinite amount of seagrass). This bug also work in survival mode.

mod version where I found the bug: Greenery-1.12.2-4.3

What's your version of Fluidlogged API?

Yes I am going to try thing rn

it's Fluidlogged-API-v2.2.4-mc1.12.2.jar

Could you try it with the latest version on Modrinth?
https://modrinth.com/mod/fluidlogged-api/versions#all-versions

the bug is still here also with this version of fluidlogged api

no problem

Okay, thanks for the report

I can not reproduce it only with Greenery installed. Do you have any other mods installed?
I presume it is an issue with some "right-click to harvest" mod.

Actually yes is it, because I tested with only greenery loaded and there wasn't the bug, but it showed up with Quark:RotN Edition, with the "right-click to harvest" module on.

here is the mod list that I have used to reproduce the bug

and when the "right-click to harvest" module from Quark is set to off, the bug doesn't appear

Okay, thanks. I will try to fix it, somehow.

@Mindr0ide can you test if this is still present in v4.4?

Fixed in v4.4