Version Info

• Minecraft, 1.16.4
• Connected Glass, 1.0.6

Description of the Bug
Mobs are spawning on the glas, reported from my server.

Steps to Reproduce
Player build a Massive glas dome with connected glas, reported mobs spawning on top of it.

Screenshots
https://i.imgur.com/kRtRj3c.png

I fixed it now in version 1.0.6a for all the Minecraft 1.16 versions.

Thank you for reporting the issue!