:tiny_potato:

MixinStatusEffectInstance.java

@Mixin(StatusEffectInstance.class)
public abstract class MixinStatusEffectInstance implements UpdateDurationSuperShim {
	@Unique
	private static final Object BLANK = new Object();
	@Shadow
	protected abstract int updateDuration();
	@Unique
	private ThreadLocal<Object> updateDurationLocal = new ThreadLocal<>();

	@Inject(method = "updateDuration", at = @At("HEAD"), cancellable = true)
	private void hookUpdateDuration(CallbackInfoReturnable<Integer> cir) {
		// If this is *not* a super call
		if(updateDurationLocal.get() == null) {
			if(this instanceof OverridesUpdateDuration) {
				// cancel + return whatever it spits out
				cir.setReturnValue(((OverridesUpdateDuration) this).patchwork$override$updateDuration());
			}
		} else {
			updateDurationLocal.remove();
			// continue with execution
		}
	}

	@Override
	public int patchwork$superShim$updateDuration() {
		updateDurationLocal.set(BLANK);
		return updateDuration();
	}

OverridesUpdateDuration.java

public interface OverridesUpdateDuration {
	public int patchwork$override$updateDuration();
}

PatchworkStatusEffectInstance.java

public class PatchworkStatusEffectInstance extends StatusEffectInstance implements OverridesUpdateDuration {
	public PatchworkStatusEffectInstance(StatusEffectInstance statusEffectInstance) {
		super(statusEffectInstance);
	}

	@Override
	public int patchwork$override$updateDuration() {
		throw new RuntimeException("duration: " + ((UpdateDurationSuperShim) this).patchwork$superShim$updateDuration());
	}

	@Override
	public int compareTo(StatusEffectInstance statusEffectInstance) {
		throw new AssertionError("unimplemented");
	}
}

UpdateDurationSuperShim.java

public interface UpdateDurationSuperShim {
	public int patchwork$superShim$updateDuration();
}