Edit (Update/Correction):

It looks like I was very likely wrong (a good thing in this case!).

According to this entry in the official Bitwarden Help Center bitwarden[.]net is official too!

Its still weired that the login failed multiple times and bitwarden[.]net doesn’t redirect to the homepage, as the other official domains do, and so on.

Nonetheless, all seems to be fine, gladly. Thanks for your input.

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I’ve tried to log into Bitwarden and used vault.bitwarden[.]net, it failed. Also, this page is the only one on this domain (nothing on bitwarden[.]net) and the SSL Certificate differs.

vault.bitwarden.com (and bitwarden.com) behaves as expected.

I think I’ve actually used a phishing site. 2FA probably safed me pretty hard. Changed creds.