When using connectedglass blocks underwater the water is showing at the side where it is touching the blocks.
A comparison between vanilla and connectedglass:

Vanilla Glass:

ConnectedGlass Glass:

If possible please make water behave the same when touching connectedglass blocks as it does in vanilla.

This seems to be only be an issue in 1.12 and 1.14.

Actually, it was only an issue in 1.14, so assume you're using that Minecraft version. (If not, please let me know)
I changed some things to make it work now in version 1.0.6a for 1.14.

Thanks for reporting the issue!

I am on 1.15.2

Yup, seems I somehow missed it last time. I also fixed it now in 1.15 with version 1.0.6a.

Thanks again!