Versions (Be specific, do not write "latest"):

• Forbidden & Arcanas: v1.3
• Forge: v28.1.44

Description of a Bug:

• Placing any glass-like block, including End Crystal Gems, Dark Beacons, and Runic Glass, underwater will render incorrectly underwater, with water flowing down the sides. Glass should render similarly to Minecraft Glass
• Custom signs also can only be placed on the ground, but not on walls. (fixed)

Image:

This can be fixed in 1.15+ by using the boolean shouldDisplayFluidOverlay()

Fixed in 1.16.3-1.0.2 :)