Description of the issue

I placed a "Extendable Post" from Immersive Posts, projected the multi-block "Diesel Generator" from Immersive Engineering on top of it. I then placed a 'pipe' from Immersive Engineering on top of the extendable post and immediately crashed. Now when I attempt to rejoin the world it happens again with the following error log - https://pastebin.com/pt7RcjRr
I am now stuck in a crash loop.

Versions and Modlist

immersiveposts-1.16.3-3.0.0.jar

Modlist- https://www.curseforge.com/minecraft/modpacks/towncraft
TownCraft TWO for 1.16.5

Crash Log

Frist crash on the server-
https://gist.github.com/ProsperCraft/f93a04732d8a2d26e9195399c26c5977
Replicated in single player-
https://pastebin.com/q2UVPTqN
https://pastebin.com/pt7RcjRr

Screenshot(s)

Video-
https://cdn.discordapp.com/attachments/104694078595182592/818932039293206538/2021-03-09_11-41-28.mp4

Try IE 1.16.5-4.2.2-132 and see if that get's rid of it. Which is the version Posts is compiled against

That isn't possible as that version does not load when silent gear is in the pack. Forward compatibility is pretty important though no?

I just now realized you're using immersiveposts-1.16.3-3.0.0.jar while immersiveposts-1.16.5-4.0.0.jar exists. Move to that please.