Flush chunk vertex consumers before changing materials

Author: FiniteReality

src/main/java/org/embeddedt/embeddium/impl/render/chunk/compile/buffers/BakedChunkModelBuilder.java

@@ -36,6 +36,7 @@ public void addSprite(TextureAtlasSprite sprite) {
 
     @Override
     public ChunkModelVertexConsumer asVertexConsumer(Material material) {
+        this.vertexConsumer.close();
         this.vertexConsumer.initialize(material);
         return this.vertexConsumer;
     }