Merge pull request #4556 from sebavan/master

Cache Fix

dist/preview release/babylon.max.js

@@ -17704,7 +17704,6 @@ var BABYLON;
             this._currentRenderId = -1;
             this._parentRenderId = -1;
             this._childRenderId = -1;
-            this._parentNode = null;
             this._animationPropertiesOverride = null;
             /**
             * An event triggered when the mesh is disposed

dist/preview release/babylon.no-module.max.js

@@ -17671,7 +17671,6 @@ var BABYLON;
             this._currentRenderId = -1;
             this._parentRenderId = -1;
             this._childRenderId = -1;
-            this._parentNode = null;
             this._animationPropertiesOverride = null;
             /**
             * An event triggered when the mesh is disposed

dist/preview release/es6.js

@@ -17671,7 +17671,6 @@ var BABYLON;
             this._currentRenderId = -1;
             this._parentRenderId = -1;
             this._childRenderId = -1;
-            this._parentNode = null;
             this._animationPropertiesOverride = null;
             /**
             * An event triggered when the mesh is disposed

dist/preview release/viewer/babylon.viewer.max.js

@@ -17792,7 +17792,6 @@ var BABYLON;
             this._currentRenderId = -1;
             this._parentRenderId = -1;
             this._childRenderId = -1;
-            this._parentNode = null;
             this._animationPropertiesOverride = null;
             /**
             * An event triggered when the mesh is disposed

src/babylon.node.ts

@@ -67,7 +67,7 @@
         /** @hidden */
         public _cache: any;
 
-        private _parentNode: Nullable<Node> = null;
+        private _parentNode: Nullable<Node>;
         private _children: Node[];
 
         /**