It’s always been like that, I’ve been using Chromcast for 3 years and I’m annoyed about it. Unfortunately in OH there is no way to enter all IP addresses of the group. While looking for an old discussion on the topic, I just discovered this discussion
https://community.openhab.org/t/solved-oh2-chromecast-binding-audio-output-on-multiple-google-home-mini-at-the-same-time/36737
and will test it right away.
