ops you are right it is not the beta opencpn but the free-x repo. Actually we switched to https://www.free-x.de/deb4op to prevent this issue.
To get rid of old repositories used in pre-releses images you have just to press "add sources" in latest openplotter-settings app and they will be removed.
To get rid of old repositories used in pre-releses images you have just to press "add sources" in latest openplotter-settings app and they will be removed.