I use Deezer HiFi since a few days and experience the same issue. I can add a little more detail to it:When casting and using some other app, sometimes Deezer is available in the Android notification area. When this is the case and starting Deezer from there, it works as expected, it picks up the song currently playing.For some reason while casting, Deezer is not always present in the Android notification area. If not, and getting Deezer active from the background, it starts a new session. It does not remember music is playing through Chromecast.This really is very very frustrating.Using Android 10 on Huawei and different chromecasts, Dongle, TV-built in, Soundbar built-in and HK Omni20 speakers built in. All of them the same issue.
I had the same problem both with an harman kardon Omni-20 and an HK soundbar. I found two solutions... First starting deezer and next from Google home select casting from the chromecast device works.But even better, I found that when the speaker is in a group with a regular chromecast, selecting the group in deezer works flawless. I have an old chromecast audio now which is in my wifi netwerk but not connected to a speaker. I Just create a group in Google home combining this dummy chromecast with a speaker and everything works fine. I have multiple group now each containing this dummy WORKS…By the way, my wife uses Spotify which has the exact same problem when using chromecast.
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