Crash on world creation when PortalJS is installed (NeoForge 21.1.217)

[Anode-1]

Description

Minecraft consistently crashes during world creation when PortalJS is installed.
After testing, I am confident that PortalJS is the source of the issue, as the crash no longer occurs when the mod is disabled.

Environment

Minecraft version: 1.21.1
Mod loader: NeoForge 21.1.217

Installed Mods

Custom Portal API Reforged 1.2.2
KubeJS 2101.7.2-build.348
PortalJS 1.1.0
Rhino 2101.2.7-build.81
(No other mods are installed.)

Steps to Reproduce

Launch Minecraft with the mods listed above.
Click Create New World.
Start world generation.

Expected Behavior
The world should generate normally and the game should load into the new world.

Actual Behavior
The game crashes during world creation with the following error:

The game crashed: exception ticking world
Error: org.spongepowered.asm.mixin.transformer.throwables.MixinTransformerError:
An unexpected critical error was encountered

Additional Information

By downgrading the version, the issue is fixed.

[wolfieboy09]

Yayyyyyyy mixin issues.... really need to work on this mod and get it fixed and everything 😭.
Will put it on my todo list this week

[P4YN-Ki]

Just dropping in to say this is happening to me too.

[wolfieboy09]

Can you send me the logs with the mixin failure? I need to know what mixin went wrong

[P4YN-Ki]

No Problem. Here's mine, I know my modpack is all over the place.

latest.log

[wolfieboy09]

java.lang.IllegalStateException: Cannot get config value before config is loaded.

That log is not a PortalJS issue...

[P4YN-Ki]

Not going to lie man, I removed PortalJS and it's requirement and continued building my modpack in the 14 hours since I came to post. I just readded them back in and deleted the log, for a clean one. If there's a new issue, then something else breaks further down the line once it's added. But that all runs without PortalJS and soon as it's added, it CTDs.

I can't roll back the modpack to what it was yesterday unfortunately. I was getting the problem with only the required mods installed on a clean instance like OP. I just setup a new instance with only the required and it's no longer CTD'ing.

crash-2026-01-09_14.32.43-server.txt Apparently this is the crash-report generated with the mixin apparently being this.

org.spongepowered.asm.mixin.transformer.throwables.MixinTransformerError
...
Caused by: org.spongepowered.asm.mixin.injection.throwables.InvalidInjectionException
Invalid descriptor on portaljs.mixins.json:PortalPlacerMixin from mod portaljs
... Expected (…) but found (…).

Clearly something else in the modpack is conflicting and since OP isn't replying with their logs, this is unfortunately all I can provide.

EDIT: Cleaned up typos.