I too hit this a few weeks ago after years of having bitwarden work perfectly for logins, and chrome filling in payment details. I have removed and re-installed the bitwarden extension today, didn’t go near the “make it default” setting, turned on autofill in the bitwarden settings, and it is back how it was - bitwarden is filling logins, chrome password manager is off, chrome save/fill payments is on and working, and there is no mention of “bitwarden is controlling this” in the chrome settings. I think once you have touched the “make bitwarden the default manager” setting, it breaks it, and turning it back off doesn’t help.