fix enable per-variant custom model caching

src/graphics/render/BlocksPreview.cpp

@@ -67,7 +67,7 @@ std::unique_ptr<ImageData> BlocksPreview::draw(
             glm::vec3 poff = glm::vec3(0.0f, 0.0f, 1.0f);
             offset.y += (1.0f - hitbox).y * 0.5f;
             shader.uniformMatrix("u_apply", glm::translate(glm::mat4(1.0f), offset));
-            const auto& model = cache.getModel(def.rt.id);
+            const auto& model = cache.getModel(def.rt.id, 0);
             
             for (const auto& mesh : model.meshes) {
                 for (const auto& vertex : mesh.vertices) {

src/graphics/render/BlocksRenderer.cpp

@@ -308,7 +308,7 @@ void BlocksRenderer::blockCustomModel(
         Z = orient.axes[2];
     }
 
-    const auto& model = cache.getModel(block.rt.id);
+    const auto& model = cache.getModel(block.rt.id, block.getVariantIndex(states.userbits));
     for (const auto& mesh : model.meshes) {
         if (vertexCount + mesh.vertices.size() >= capacity) {
             overflow = true;