I autogenerate a password in Lastpass. Copy it to the clipboard. Go to the app and fill in the password.I go back to Lastpass to paste the new password into Lastpass and the password is gone. No longer in the clipboard.
I cannot recover the password in Lastpass as, unlike the desktop app, the iOs app doesn't remember any of the generated passwords.
This has happened to me several times.It seems that the Lastpass app on iOS is substandard compared to the desktop app.