I’m wondering whether the decision of not auto-connecting the password-manager-service interface should be revisited?
I understand the security implications and they are of course valid, but on the other hand for users that are being upgraded from the deb package to the snap, not having the interface auto-connected means that they suddenly see all their stored passwords vanish (they are still stored in the session keyring, but chromium cannot access them).
An alternative solution would be to not do the auto-connection at the store level, but do it in the deb’s pre-install script (which installs the snap from the store, and is executed as root). That has pretty much the same security implications though, so I’d welcome @jdstrand and others’ opinion before testing this.
I filed bug #1836616 to track the issue.