Markers are actually hidden now. Inspecting the markers in NifSkope revealed why it didn't work previously: the flag that is being looked for is not present in any of the markers, nor any other flag or extra data to identify them. However, the root node name always starts with "marker", making it possible to do a string search.

components/nifbullet/bullet_nif_loader.cpp

@@ -164,6 +164,11 @@ void ManualBulletShapeLoader::handleNode(Nif::Node *node, int flags,
     // the flags we currently use, at least.
     flags |= node->flags;
 
+    // Marker objects: just skip the entire node
+    /// \todo don't do this in the editor
+    if (node->name.find("marker") != std::string::npos)
+        return;
+
     // Check for extra data
     Nif::Extra *e = node;
     while (!e->extra.empty())

components/nifogre/ogre_nif_loader.cpp

@@ -940,6 +940,11 @@ public:
     {
         flags |= node->flags;
 
+        // Marker objects: just skip the entire node
+        /// \todo don't do this in the editor
+        if (node->name.find("marker") != std::string::npos)
+            return;
+
         Nif::ExtraPtr e = node->extra;
         while(!e.empty())
         {