Version: NoCubes-1.20.1-0.5.0-dev-b81a6c5.jar
This happens while extend fluids range is not modified
https://github.com/Cadiboo/NoCubes/assets/28939939/e442488d-b981-41e7-bbcf-ca70ed608bc5

Hmm yes I can probably hack a check into minecraft’s ‘is source block’/‘should create new source block’ calculation to not consider surrounding blocks as being a source block if they are a smooth block. The trick is to do it in a way that still lets players swim through these extended fluids and let crops grow next to them…