Is it a mod compatibility issue?

Yes

If it's a mod compatibility issue, please provide the link(s) to the incompatible mod(s)

https://www.curseforge.com/minecraft/mc-mods/valkyrien-skies
https://github.com/ValkyrienSkies/Valkyrien-Skies-2 (check the github for updated versions)

Minecraft version

1.18.x

Describe the issue

When I assemble a ship with valkyrien skies when immersive portals is installed, it doesn't load properly.

Check this post out: #1549

#1530