diff --git a/client/ayon_harmony/js/loaders/TemplateLoader.js b/client/ayon_harmony/js/loaders/TemplateLoader.js
index e0f2ab89..f98df231 100644
--- a/client/ayon_harmony/js/loaders/TemplateLoader.js
+++ b/client/ayon_harmony/js/loaders/TemplateLoader.js
@@ -37,6 +37,7 @@ TemplateLoader.prototype.loadContainer = function(args) {
     var templatePath = args[0];
     var overrideName = args[1] || "";
     var parentBackdropName = args[2] || null;
+    var existingNames = args[3] || [];
 
     // Copy from template file
     MessageLog.trace("loadContainer:: ");
@@ -51,7 +52,7 @@ TemplateLoader.prototype.loadContainer = function(args) {
     function parseBackdropName(name) {
         var lastIndex = name.lastIndexOf('_');
         if (lastIndex === -1) {
-            return { baseName: name, count: 1 };
+            return { baseName: name, count: 0 };
         }
         var base = name.substring(0, lastIndex);
         var suffix = name.substring(lastIndex + 1);
@@ -60,7 +61,7 @@ TemplateLoader.prototype.loadContainer = function(args) {
         if (isNumericSuffix) {
             return { baseName: base, count: increment };
         }
-        return { baseName: name, count: 1 };
+        return { baseName: name, count: 0 };
     }
 
     var _copyOptions = copyPaste.getCurrentCreateOptions();
@@ -134,27 +135,28 @@ TemplateLoader.prototype.loadContainer = function(args) {
             mainBackdrop.title.text = overrideName;
         }
 
-        // Count existing backdrops by base name
-        var backdropCounts = {};
-        for (var i = 0; i < allBackdrops.length; i++) {
-            var parsed = parseBackdropName(allBackdrops[i].title.text);
-            var baseName = parsed.baseName;
-            var count = parsed.count;
-
-            if (backdropCounts[baseName]) {
-                backdropCounts[baseName]++;
-            } else {
-                backdropCounts[baseName] = count;
+        var mainBackdropBaseName = parseBackdropName(mainBackdrop.title.text).baseName;
+
+        // Collect used suffix slots for this baseName, based on the
+        // Python-provided list of already-registered container names
+        var usedNumbers = [];
+        for (var n = 0; n < existingNames.length; n++) {
+            var parsed = parseBackdropName(existingNames[n]);
+            if (parsed.baseName !== mainBackdropBaseName) {
+                continue;
             }
+            usedNumbers.push(parsed.count);
         }
 
-        // Increment count of backdrop with the same base name
-        var mainBackdropName = mainBackdrop.title.text;
-        var mainBackdropParsed = parseBackdropName(mainBackdropName);
-        var count = backdropCounts[mainBackdropParsed.baseName] !== undefined ? backdropCounts[mainBackdropParsed.baseName] : 1;
-        if (count > 1){
-            // count -1 to match imported nodes which start from _1
-            mainBackdropName = mainBackdropName + "_" + (count - 1);
+        var mainBackdropName;
+        if (usedNumbers.indexOf(0) === -1) {
+            mainBackdropName = mainBackdropBaseName;
+        } else {
+            var nextSuffix = 1;
+            while (usedNumbers.indexOf(nextSuffix) !== -1) {
+                nextSuffix++;
+            }
+            mainBackdropName = mainBackdropBaseName + "_" + nextSuffix;
         }
 
         // Set name of main backdrop (always at index 0)
diff --git a/client/ayon_harmony/plugins/load/load_template.py b/client/ayon_harmony/plugins/load/load_template.py
index 1aa4f942..af77ef88 100644
--- a/client/ayon_harmony/plugins/load/load_template.py
+++ b/client/ayon_harmony/plugins/load/load_template.py
@@ -42,6 +42,13 @@ def load(self, context, name=None, namespace=None, data=None):
         if self.parent_backdrop_matching:
             parent_backdrop_name = self._resolve_parent_backdrop_name(context)
 
+        scene_data = harmony.get_scene_data() or {}
+        existing_names = [
+            entity_name
+            for entity_name, entity_data in scene_data.items()
+            if isinstance(entity_data, dict) and entity_data.get("loader")
+        ]
+
         with zipfile.ZipFile(zip_file, "r") as zip_ref:
             zip_ref.extractall(temp_dir)
 
@@ -53,7 +60,8 @@ def load(self, context, name=None, namespace=None, data=None):
                 "args": [
                     next(Path(temp_dir).glob("*.tpl")).as_posix(),
                     override_name,
-                    parent_backdrop_name
+                    parent_backdrop_name,
+                    existing_names,
                 ],
             }
         )["result"]
diff --git a/client/ayon_harmony/vendor/OpenHarmony b/client/ayon_harmony/vendor/OpenHarmony
deleted file mode 160000
index 763169ba..00000000
--- a/client/ayon_harmony/vendor/OpenHarmony
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 763169ba8a6c5c941d9691ce9caaddf13c5d9b52