fix: register all requested microblock metadata variants

docs/migration/DIVERGENCES.md

@@ -15,6 +15,7 @@ audit, before extending this list.
 | Area | Difference and consequence |
 | --- | --- |
 | Raw microblock recipe material lookup | Skips `MissingMicroMaterial`, whose recovery item is stone, so sawing stone selects the real stone material. Existing missing-material microblocks retain their recovery behavior. This fixes a pre-existing Scala bug. |
+| `BlockMicroMaterial.createAndRegister(Block, Seq, String)` | Registers every supplied metadata value instead of only zero, including dark-oak logs and leaves and their legacy-name remaps. This fixes a pre-existing Scala bug; material IDs are rebuilt through the existing registry mapping. |
 | `IDWriter` before `setMax` | `read`/`write` throw `IllegalStateException` instead of `NullPointerException`. Uninitialized use is unsupported. |
 | `PacketScheduler` invalid `maskWidth` | Throws `IllegalArgumentException` instead of `scala.MatchError`. Valid widths remain 1, 2, 4 and 8. |
 | `NormalOcclusionTest.apply(Traversable, Traversable)` | Materializes both inputs into Java lists before testing instead of nested Scala `forall`. Finite, side-effect-free collections give the same result; eager traversal can change side effects, failure timing and termination for unusual inputs. |

src/functionalTest/java/codechicken/multipart/test/DefaultContentFunctionalTest.java

@@ -360,9 +360,9 @@ class DefaultContentFunctionalTest {
         add(expectedNames, expectedRemaps, Blocks.cobblestone, "minecraft:cobblestone", 0);
         add(expectedNames, expectedRemaps, Blocks.planks, "minecraft:planks", 5);
         add(expectedNames, expectedRemaps, Blocks.log, "minecraft:log", 3);
-        add(expectedNames, expectedRemaps, Blocks.log2, "minecraft:log2", 0, "tile.log2");
+        add(expectedNames, expectedRemaps, Blocks.log2, "minecraft:log2", 1, "tile.log2");
         add(expectedNames, expectedRemaps, Blocks.leaves, "minecraft:leaves", 3);
-        add(expectedNames, expectedRemaps, Blocks.leaves2, "minecraft:leaves2", 0, "tile.leaves2");
+        add(expectedNames, expectedRemaps, Blocks.leaves2, "minecraft:leaves2", 1, "tile.leaves2");
         add(expectedNames, expectedRemaps, Blocks.sponge, "minecraft:sponge", 0);
         add(expectedNames, expectedRemaps, Blocks.glass, "minecraft:glass", 0);
         add(expectedNames, expectedRemaps, Blocks.lapis_block, "minecraft:lapis_block", 0);
@@ -419,7 +419,7 @@ class DefaultContentFunctionalTest {
             }
         }
 
-        assertEquals(119, expectedNames.size());
+        assertEquals(121, expectedNames.size());
         assertEquals(expectedNames, actualNames);
         assertEquals(expectedRemaps, materialRemaps());
     }

src/functionalTest/java/codechicken/multipart/test/MicroRecipeFunctionalTest.java

@@ -7,6 +7,7 @@ import static org.junit.jupiter.api.Assertions.assertNull;
 import static org.junit.jupiter.api.Assertions.assertSame;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
+import net.minecraft.block.Block;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.init.Blocks;
 import net.minecraft.inventory.Container;
@@ -17,6 +18,7 @@ import net.minecraft.nbt.NBTTagCompound;
 
 import org.junit.jupiter.api.Test;
 
+import codechicken.microblock.BlockMicroMaterial;
 import codechicken.microblock.ItemMicroPart;
 import codechicken.microblock.MicroMaterialRegistry;
 import codechicken.microblock.MicroRecipe;
@@ -41,6 +43,22 @@ class MicroRecipeFunctionalTest {
         assertMicro(MicroRecipe.getCraftingResult(crafting), 2, 0, 2, material);
     }
 
+    @Test
+    void cuttingDarkOakLogsAndLeavesRetainsTheirMetadata() {
+        for (Block block : new Block[] { Blocks.log2, Blocks.leaves2 }) {
+            String name = BlockMicroMaterial.materialKey(block, 1);
+            assertTrue(MicroMaterialRegistry.getMaterial(name) instanceof BlockMicroMaterial);
+            int material = MicroMaterialRegistry.materialID(name);
+            InventoryCrafting crafting = grid();
+            crafting.setInventorySlotContents(0, new ItemStack(new TestSaw(100)));
+            crafting.setInventorySlotContents(3, new ItemStack(block, 1, 1));
+            assertMicro(MicroRecipe.getCraftingResult(crafting), 2, 0, 4, material);
+            ItemStack restored = MicroRecipe.create(1, 0, 8, material);
+            assertSame(Item.getItemFromBlock(block), restored.getItem());
+            assertEquals(1, restored.getItemDamage());
+        }
+    }
+
     @Test
     void recipeMetadataMaterialLookupAndCreationRoundTrip() {
         int material = glassMaterial();

src/main/scala/codechicken/microblock/BlockMicroMaterial$.java

@@ -53,7 +53,7 @@ public final class BlockMicroMaterial$ {
     }
 
     public void createAndRegister(Block block, Seq<Object> meta, String oldName) {
-        createAndRegister(block, 0, materialKey(block), oldName);
+        createAndRegister(block, meta, materialKey(block), oldName);
     }
 
     public void createAndRegister(Block block, Seq<Object> meta, String name, String oldName) {