When I launch Chrome from Plasma, my saved passwords are not available. It doesn't seem to save new passwords either. If I launch from Gnome, everything is fine.
I gather this is a problem that Chrome wants to use kdewallet. However, the fixes that used to stop Chrome from doing this don't seem to work anymore. I have added "--password-store=basic" to the end of /opt/google/chrome/google-chrome and .config/kwalletrc still shows kwallet is disabled. I would guess that the config file moved, but where? I don't see any settings program for kwallet either.
Chrome will not store passwords with kde 5.20
Message
I found a fix that does work. I had to delete the files Login Data and Login Data-journal. See http://plasmasturm.org/log/chromepwstore/