Earlier quoted context omitted.
I was on Bitwarden for a bit. I really really like the secure notes feature, it's great for storing secrets like keys that aren't used in a browser or android app. But Google is so much more convenient. I still wonder why there's no completely P2P password manager using SyncThing plus a layer of encryption. We have this near perfect tool for making multidevice apps but we don't use it for much!
I mean, you could use pass, which stores all your passwords in a gpg encrypted file. It works very well out of the box with syncthing, or anything else that can move around files, like git-annex. https://www.passwordstore.org/ KeePassX works fairly well with syncthing as well, if I remember. https://www.keepassx.org/
I've heard KeePassX can have sync conflicts if you edit on multiple devices with the wrong timing.
I think for a real conflict-free experience you'd need to put each password in its own file, or give each device a logfile to publish CRDT updates with cr-sqlite(Looking into adding that to a baserow style app).