Avoid `this._chunks.copy()` being used by PhongMaterial to generate a hash key for the shader.
Avoid `this._chunks.copy()` being used by PhongMaterial to generate a hash key for the shader.

MicroWorldwide/PlayCanvas,H1Gdev/engine,playcanvas/engine,guycalledfrank/engine,playcanvas/engine,aidinabedi/playcanvas-engine,sereepap2029/playcanvas,H1Gdev/engine,aidinabedi/playcanvas-engine,sereepap2029/playcanvas,sereepap2029/playcanvas,guycalledfrank/engine,MicroWorldwide/PlayCanvas