Schematic Placement Rendering Crashes the Game

[MEEPofFaith]

Provide at least the following information

• Minecraft version - 1.21
• litematica version - litematica-fabric-1.21.1-0.19.50.jar
• malilib version - malilib-fabric-1.21.1-0.21.0.jar

When I placed the attached schematic into the world, the game crashes. I believe it has something to do with entities in the schematic since looking at blocks in the schematic do not crash the game.
Firework Farm.zip
crash-2024-08-29_19.27.28-client.txt

Since I'm playing with a kgjhillion client-side mods, it's possible that it's an incompatibility issue with some other mod.
I've tried with disabling sodium, iris, and entity model/texture features and the crash still occurs, so I do not know which mod that's causing it.

[maruohon]

It's an issue in something called Polytone. It's trying to do something while entities in Litematica's schematic world are being rendered, and it tries to cast the schematic world to a vanilla ClientWorld, but the schematic world does not extend the ClientWorld, so it crashes.