Create: Contraption Combat (6.0.8)

# Create: Contraption (VirtualWorld) Compat

A universal compatibility mod that fixes crashes when placing block entities from various mods on Create contraptions.

## The Problem

In Create 6. 0. 8, placing certain block entities on contraptions causes the game to crash with:

``` java.lang. UnsupportedOperationException: VirtualRenderWorld doesn't maintain a chunk array.     at com.simibubi.create.content.contraptions.render. VirtualRenderWorld.getChunk(VirtualRenderWorld.java:69) ```

This occurs because Create 6. 0. 8 introduced a change where block entities are loaded into a `VirtualRenderWorld` before their NBT data is processed. When block entities call `setChanged()` during initialization, it triggers `Level.blockEntityChanged()` which tries to mark chunks as unsaved - but `VirtualRenderWorld` is a lightweight render-only world that doesn't support chunk operations.

And is solved in Create 6. 0. 9

## The Solution

This mod uses a Mixin to intercept calls to `Level.blockEntityChanged()` and cancels them when the level is a `VirtualRenderWorld`. Since `VirtualRenderWorld` is temporary and never persists, marking chunks as unsaved is unnecessary and can be safely skipped.

``` @Mixin(value = Level.class) public class VirtualRenderWorldMixin {     @Inject(method = "blockEntityChanged", at = @At("HEAD"), cancellable = true)     public void preventBlockEntityChangedInVirtualWorld(BlockPos pos, CallbackInfo ci) {         if ((Object) this instanceof VirtualRenderWorld) {             ci.cancel();         }     } } ```

### Compatibility Affected Mods This fix is universal and works with any mod where block entities call `setChanged()` during loading:

### Requirements - Minecraft: 1. 21. 1 - NeoForge: 21. 1. 209+ - Create: 6. 0. 8+ (the issue doesn't exist in 6. 0. 6 and earlier) - Flywheel: 1. 0. 5+

## Credits - Create Team - For the amazing Create mod - NeoForge Team - For the modding framework