Fix clone observables

dist/preview release/what's new.md

@@ -140,6 +140,7 @@
 - Fixed infiniteDistance not working anymore ([Sebavan](https://github.com/Sebavan))
 - Fixed bug in SolidParticle BoundingSphere update within the SolidParticleSystem ([barroij](https://github.com/barroij))
 - Update Picking so that when the picked Mesh is a LinesMesh, the index of the picked line is returned in the `faceId` property of the `PickingInfo`, as we do with face index the picked Mesh is made of triangle faces ([barroij](https://github.com/barroij))
+- Do not clone mesh observables ([Sebavan](https://github.com/Sebavan))
 
 ### Viewer
 

src/Mesh/babylon.mesh.ts

@@ -264,7 +264,9 @@ module BABYLON {
                 // Deep copy
                 Tools.DeepCopy(source, this, ["name", "material", "skeleton", "instances", "parent", "uniqueId",
                     "source", "metadata", "hasLODLevels", "geometry", "isBlocked", "areNormalsFrozen",
-                    "onBeforeDrawObservable", "onBeforeRenderObservable", "onAfterRenderObservable", "onBeforeDraw"
+                    "onBeforeDrawObservable", "onBeforeRenderObservable", "onAfterRenderObservable", "onBeforeDraw",
+                    "onAfterWorldMatrixUpdateObservable", "onCollideObservable", "onCollisionPositionChangeObservable", "onRebuildObservable",
+                    "onDisposeObservable"
                 ],
                     ["_poseMatrix"]);