Zero is valid id

Author: aromaa

src/main/java/org/spongepowered/common/world/schematic/PaletteWrapper.java

@@ -79,10 +79,10 @@ public Optional<PaletteReference<T, R>> get(int id) {
     @Override
     public OptionalInt get(T type) {
         final var id = this.proxy.getId((NT) type);
-        if (id <= 0) {
-            return OptionalInt.empty();
+        if (id >= 0) {
+            return OptionalInt.of(id);
         }
-        return OptionalInt.of(id);
+        return OptionalInt.empty();
     }
 
     @SuppressWarnings("unchecked")

src/mixins/java/org/spongepowered/common/mixin/api/minecraft/world/level/chunk/ChunkAccessMixin_API.java

@@ -29,8 +29,8 @@
 import net.minecraft.world.level.LevelHeightAccessor;
 import net.minecraft.world.level.block.Block;
 import net.minecraft.world.level.chunk.ChunkAccess;
-import net.minecraft.world.level.chunk.ChunkStatus;
 import net.minecraft.world.level.chunk.LevelChunkSection;
+import net.minecraft.world.level.chunk.status.ChunkStatus;
 import net.minecraft.world.level.levelgen.Heightmap;
 import org.spongepowered.api.block.BlockState;
 import org.spongepowered.api.block.BlockType;