Generally speaking, it is a VERY, VERY, VERY bad idea to store TOTP seeds at the same location you are storing your passwords for sites. Then it kinda nullifies the whole purpose of 2-factor-authentication! If attacker gets their hands on your Bitwarden wault to get your password, they would now ALSO get your 2FA:s (TOTP) and gain access to your accounts!!!
The whole purpose of 2FA is to be, well, 2FA. An other factor incase someone breaks your 1 line of defence. If they can get that aswell as they get your passwords, it makes absolutely no sense to use 2FA at all, since it zero additional protection in case of compromise.
Personally I keep and use my TOTP:s on my iPhones TOTP app, this way even if my Bitwarden/computer would be hacked, the attacker still cannot gain access to any of my accounts, since he cant get the TOTP:s from my iPhone. I keep backups of my TOTP:s and TOTP seeds on KeePassXC database inside encrypted container, that I open very, very rarely and only after making sure my computer is not hacked. This is the way TOTP:s should be stored and used. NOT inside the very same password manager you use daily and is prone to hackers.