Lossless Audio on Chromecast

How do I know that my device is playing lossless audio when I Chromecast?

Whenever I play music on my headphones or just any other way the lossless icon appears. However it disappears as soon as I chromecast on my 'Beosound Level'.

I'm pretty sure the icon used to appear before, but it doesn't anymore, and the settings are fine. (Or maybe my memory is bad)

For some reason, it does matter to me that the audio must be lossless.

Thanks!