Chromecast support, again

There is still crappy support for Chromecast...

First, it seems like the app disconnects from Chromecast when the screen is turned off.
When I open the phone and change song, the Chromecast icon shows connected, but the new song I’m starting starts playing on my phone, while the other song is playing on my hifi system. 

Second, when I connect to Chromecast, and start a song, the song starts playing on my hifi system, but is not controllable from my phone.  I’m not able to pause the song, switch song, or do anything else on my phone which have impact on the song playing on my hifi system, even thought the Chromecast connection shows connected. Whatever I do it’s only apply to my phone speakers. 
The only way so solve this is to disconnect and connect again to select a new song. Earlier it was possible to set the app on pause. Then restart the app and connect again, wait a few seconds after the app is connected to Chromecast and then start the song. Then it would work. Not anymore. 

Annoying!

When will the chromecast issues be fixed?

Deezer app v 8.0.42.3 on a Pixel 8 with Android version 14.
I’m located in Europe.