Fix Parallelization Output Voiding

src/main/java/com/nomiceu/nomilabs/mixin/gregtech/OverlayedItemHandlerMixin.java

@@ -0,0 +1,32 @@
+package com.nomiceu.nomilabs.mixin.gregtech;
+
+import net.minecraft.item.ItemStack;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+import org.spongepowered.asm.mixin.injection.callback.LocalCapture;
+
+import com.llamalad7.mixinextras.sugar.Local;
+import com.llamalad7.mixinextras.sugar.ref.LocalIntRef;
+
+import gregtech.api.util.OverlayedItemHandler;
+
+/**
+ * Ensures items inputted into new slots take into account the stack's max stack size.
+ */
+@Mixin(value = OverlayedItemHandler.class, remap = false)
+public class OverlayedItemHandlerMixin {
+
+    @Inject(method = "insertStackedItemStack",
+            at = @At(value = "INVOKE",
+                     target = "Lgregtech/api/util/OverlayedItemHandler$OverlayedItemHandlerSlot;setItemStack(Lnet/minecraft/item/ItemStack;)V",
+                     ordinal = 0),
+            require = 1,
+            locals = LocalCapture.CAPTURE_FAILEXCEPTION)
+    private void changeCanInsert(ItemStack stack, int amountToInsert, CallbackInfoReturnable<Integer> cir,
+                                 @Local(index = 7) LocalIntRef insertedAmount) {
+        insertedAmount.set(Math.min(insertedAmount.get(), stack.getMaxStackSize()));
+    }
+}

src/main/resources/mixins.nomilabs.gregtech.json

@@ -22,6 +22,7 @@
     "MetaTileEntityProcessingArrayMixin",
     "MultiblockInfoCategoryMixin",
     "OreDictUnifierAccessor",
+    "OverlayedItemHandlerMixin",
     "ProcessingArrayWorkableMixin",
     "RecipeBuilderMixin",
     "RecipeMapMixin",