Minecraft v1.14.4
Forge v28.1.90
Dark Utils v2.0

• Glass will display flowing water on its sides when placed underwater.
• Item Grate & Ender Hopper was missed and can't be waterlogged.

Thanks for reporting this issue. Both should be fixed in the new snapshot on CF. The glass blocks should also now affect beacon block colors.

I also recently found out that Crucibles and Filter blocks also render with flowing water down their sides when placed underwater.

As those are not glass blocks they will have to wait for MinecraftForge/MinecraftForge#6319 to be addressed.