• Minecraft version 1.12
• Dregora version 1.4, 1.5, 1.5.1
• Environment Type (Forge or Server such as Spigot) forge-1.12.2-14.23.5.2806-installer-win
• Steps to reproduce the problem Look in rivers

There are stretches along the rivers under the surface which are filled with air. Pictures included:

Noticed a similar thing on another portion of the map where there are giant canyons with lava and water just hanging there instead of flowing down. I think you need to do something to prompt liquid blocks to do a block update after they're done spawning in. From experiences with other mods that spawn things in, same applies to blocks that provide light.

This issue is present when running on Spigot 1.12.2 with OTG

I don't know if this issue is linked with an option in the config folder. Like
RiverRarity: 8

RiverSize: 0

RiversEnabled: false

ImprovedRivers: false

RandomRivers: false

Once aigain on my older laptop running the previous minecraft launcher, this issue was not a thing... On the other hand. I've created for fun some vanilla maps and the collor or effect of such missing water block look amazing! Cheer up your mods are really amazing!
edit : I'm glad to meet an another consumer of plants2 mod!! I can't do without it :P

Issue fixed as of v1.6.

Thanks for reporting this issue!!