Cubase 12 no audio in group channels

Hi everyone!
I just moved from Windows to Mac m1. If I open a Cubase 12 project from my windows pc in Cubase 12 on my Macbook, the audio is not send to group channels. It seems to only happen to group channels that were created in Cubase 12. Channels created in an older version but in the same project, are working fine.
If I create new group and route the audio there, it works. But that would be an awful lot of work in many projects.
Is this a known bug or can anyone help?

Hi and welcome to the forum,

Could you try to click the Deactivate All Mute States and Deactivate All Solo States buttons, please?