12626: add explaination for clone failure

app/controllers/admin/products_v3_controller.rb

@@ -84,8 +84,8 @@ def clone
         @producer_options = producers
         @category_options = categories
         @tax_category_options = tax_category_options
-      rescue ActiveRecord::ActiveRecordError => _e
-        flash.now[:error] = t('.error')
+      rescue ActiveRecord::ActiveRecordError => e
+        flash.now[:error] = clone_error_message(e)
         status = :unprocessable_entity
         @product_index = "-1" # Create a unique enough index
       end
@@ -209,6 +209,15 @@ def products_bulk_params
       params.permit(products: ::PermittedAttributes::Product.attributes)
         .to_h.with_indifferent_access
     end
+
+    def clone_error_message(error)
+      case error
+      when ActiveRecord::RecordInvalid
+        error.record.errors.map(&:full_message).join("; ")
+      else
+        t('.error')
+      end
+    end
   end
 end
 # rubocop:enable Metrics/ClassLength

spec/system/admin/products_v3/actions_spec.rb

@@ -269,7 +269,7 @@ def expect_other_columns_visible
 
           click_product_clone "Apples"
 
-          expect(page).to have_content "Unable to clone the product"
+          expect(page).to have_content "Variant Unit can't be blank"
 
           within "table.products" do
             # Products does not include the cloned product.