Seems like they have some version of it implemented:
> Q: I need an old password! Can I view the history of a password that I changed in Bitwarden?
> A: Yes! You can view the last 5 passwords for any Login Item. Open the item in question and select the “1” next to Password History near the bottom of the window.
> Q: I need an old password! Can I view the history of a password that I changed in Bitwarden?
> A: Yes! You can view the last 5 passwords for any Login Item. Open the item in question and select the “1” next to Password History near the bottom of the window.
https://bitwarden.com/help/article/product-faqs/