This happens to me on Firefox.

https://recordit.co/QdK2FrRoYX I copy the password, go to paste it in and it loses the selected account:

https://recordit.co/jrvUFWCPkS Here, I go to add an account. I generate a new password and then I try to paste it into the text box to verify it meets the website's password rules. I then go back to hit save, confirming that it worked and it loses the entry.

Sooo frustrating.

You can just right click on the text box and use the context menu to make this task much easier.

oo that is a cool trick! but it doesn't work if you're looking for an account that doesn't match the current URL (like if you created the account on the mobile app)

In that case it's simpler to find the right password entry, click edit on it and add the current domain to the list of domains it keeps for the entry. That way you won't need to mess with the copy/paste button.

I use Bitwarden myself and I only need the copy/paste button for stuff like email and WiFi passwords. If you're manually copying and pasting data, you're probably overlooking one of the many (sometimes not clearly indicated) features Bitwarden has.

Hope this helps!