diff --git a/src/main/java/com/gregtechceu/gtceu/integration/ae2/machine/MEPatternBufferPartMachine.java b/src/main/java/com/gregtechceu/gtceu/integration/ae2/machine/MEPatternBufferPartMachine.java
index 0d7ff36cbfa..fe940b55229 100644
--- a/src/main/java/com/gregtechceu/gtceu/integration/ae2/machine/MEPatternBufferPartMachine.java
+++ b/src/main/java/com/gregtechceu/gtceu/integration/ae2/machine/MEPatternBufferPartMachine.java
@@ -152,6 +152,8 @@ public MEPatternBufferPartMachine(BlockEntityCreationInfo info) {
         this.shareInventory = attachTrait(new NotifiableItemStackHandler(9, IO.IN, IO.NONE));
         this.shareTank = attachTrait(new NotifiableFluidTank(9, 8 * FluidType.BUCKET_VOLUME, IO.IN, IO.NONE));
         this.internalRecipeHandler = new InternalSlotRecipeHandler(this, internalInventory);
+        // Inventory isn't used; prevent items being inserted (e.g., via hoppers) and becoming inaccessible.
+        this.getInventory().setFilter((ignored) -> false);
     }
 
     @Override