diff --git a/libraries/render-utils/src/Model.cpp b/libraries/render-utils/src/Model.cpp
index 6aae7ad1cb..5b9bfdca3d 100644
--- a/libraries/render-utils/src/Model.cpp
+++ b/libraries/render-utils/src/Model.cpp
@@ -135,9 +135,6 @@ void Model::reset() {
         const FBXGeometry& geometry = _geometry->getFBXGeometry();
         _rig->reset(geometry.joints);
     }
-    _meshGroupsKnown = false;
-    _readyWhenAdded = false; // in case any of our users are using scenes
-    invalidCalculatedMeshBoxes(); // if we have to reload, we need to assume our mesh boxes are all invalid
 }
 
 bool Model::updateGeometry() {
@@ -1156,6 +1153,9 @@ void Model::segregateMeshGroups() {
         return;
     }
 
+    Q_ASSERT(_renderItems.isEmpty()); // We should not have any existing renderItems if we enter this section of code
+    Q_ASSERT(_renderItemsSet.isEmpty()); // We should not have any existing renderItemsSet if we enter this section of code
+
     _renderItemsSet.clear();
 
     // Run through all of the meshes, and place them into their segregated, but unsorted buckets