Can't disable loader property and apply a theme when initializing SciChartSurface

[Amalthean]

Unable to reliably disable loader property when initializing SciChartSurface.
Here is an excerpt of the code when trying to initialize the SciChartSurface.

    const theme = { ...new SciChartJsNavyTheme() };

    // ...
    const { sciChartSurface, wasmContext } = await SciChartSurface.create(
      rootElement,
      {
        loader: false,  // without scichart-angular component this method works
        theme,
        disableAspect: true,
      }
    );
   // ...
   sciChartSurface.background = 'transparent'; // this also does not work, I see the `<scichart-fallback>` blink for a short time

What I can see in the browser Elements section is the following:

So it seems that the <scichart-fallback> is activated for a short time.
I also don't see the theme being applied correctly during the initialization phase.