Force every remaining ResourceLoader module to load. Your window will look weird but you may spot a JavaScript error.

load_all_ResourceLoader.js

mw.loader.getModuleNames().filter(
    function (module) {
        var state;
        if ( mw.loader.getState( module) === 'registered' ) {
            try {
                mw.loader.load( module );
            } catch (exception) {
                console.log ( "Module", module, 'had exception', exception);
            }
        }
        state = mw.loader.getState( module );
        if ( state !== 'ready' ) {
            console.log( module + ' still in funky state ' + state );
        }
    }
);