I also tried rebooting. And after all that the connection between chromium and password-maager seems to be existing:
XXX@koira:~$ snap connections chromium | grep password
password-manager-service chromium:password-manager-service :password-manager-service manual
I also tried rebooting. And after all that the connection between chromium and password-maager seems to be existing: manager- service chromium: password- manager- service :password- manager- service manual
XXX@koira:~$ snap connections chromium | grep password
password-