fix mesh cloning

src/Meshes/mesh.ts

@@ -328,7 +328,7 @@ export class Mesh extends AbstractMesh implements IGetSetVerticesData {
             // Deep copy
             DeepCopier.DeepCopy(source, this, ["name", "material", "skeleton", "instances", "parent", "uniqueId",
                 "source", "metadata", "hasLODLevels", "geometry", "isBlocked", "areNormalsFrozen",
-                "onBeforeDrawObservable", "onBeforeRenderObservable", "onAfterRenderObservable", "onBeforeDraw",
+                "onBeforeDrawObservable", "onBeforeRenderObservable", "onBeforeBindObservable", "onAfterRenderObservable", "onBeforeDraw",
                 "onAfterWorldMatrixUpdateObservable", "onCollideObservable", "onCollisionPositionChangeObservable", "onRebuildObservable",
                 "onDisposeObservable"
             ],