If you go that long without updating, I think that is to be expected. It's hard to make everything backwards compatible forever.

Export database as a json using one of the devices (browser extension or app), completely reinstall the bitwarden server, clearing its database.

I also recommend using vaultwaden instead bitwarden server.

If you want something even more based and simpler: keepass + syncthing

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Just the extension is broken, the vault on their website works normally.

I thought about running Vaultwarden, but I don't trust myself to run servers.

Maybe I'll try Keepass + Syncthing.