iPhone 12 Pro max (IOS14.4) won't unmute group message

I muted a group conversation on iPhone pro max iOS 14.4. Now when I unmute it, it goes back to mute when I receive a message on the group. I've tried going into info and unmuting, also swiping left on the group name and unmuting. Still goes back to muted. I've also tried turning off alerts in messages, restarting and turning message alerts back on. Still the same thing happens. I also tried deleting the conversation and having someone add me back on. It will say unmuted until I receive a message on it and then it will mute it and I don't know it is there until I physically look at phone. (no audio). My other messages are fine. But I've never muted them and tried to unmute them. Does anyone have any suggestions on how I can fix this? Thank you for your help.