I deleted the 1Password account credentials from 1Password...

I needed to create a new entry for my 1password account, after I accidentically deleted it (also from the archive).
After creation of the new entry the value for the secret key (sorry for the confusion) was saved as text-field in 1password, which I wanted to change. Which was not possible in the v8 client of 1password. I then changed that field on the website to a password field.
After doing this, the secret key does not get filled in automatically anymore and the field on the login is left empty.
When I change back the secret key to a text field, it does get filled in automatically again.

What I do not understand: On my initial entry of the 1password account, the secret key was a password field, but obviously, as I found out it was previously filled using the saved webform data, which does not seem to exist on newer 1password entries anymore. What I want to achieve is that my 1password account can get stored in 1password with the secret key hidden from view again.