Importing inspector into es6 bundle overrides validate setting on SceneLoader

Repro packages:

    "@babylonjs/core": "5.0.0-alpha.20",
    "@babylonjs/inspector": "5.0.0-alpha.20",
    "@babylonjs/loaders": "5.0.0-alpha.20",

add import "@babylonjs/inspector" into your bundle

use the following code snip

SceneLoader.OnPluginActivatedObservable.add(function (loader) {
    loader.validate = false;
    loader._validate = () => {
        console.log("loader validate is: ", loader.validate)
    }
})

Loader validate will be true when inspector is present in the bundle.

---

We have url parameters we use on dev builds to control bringing the inspector up or not. For now setting _validate on the loader to an empty function gets around the problem.

[deltakosh]

Ok done. Only Sandbox will enable it 😃 Undefined elsewhere

[deltakosh]

Sure we can!