I tried the scenario described by @kangus in Firefox and I can duplicate his issue with the Password field. The only extension I’m running is Bitwarden. I also confirmed that the problem persists even with the Firefox Password Manager turned off.
@kangus What OS and Chrome version are you using? Were you using autofill on page load, or manual autofill (Ctrl+Shift+L)?
Above, I showed that for my setup (Chrome 111 on Windows 10), the autofill function works as expected on the getpocket.com login form, when using Ctrl+Shift+L (with autofill on page load disabled).
I can now reproduce the issue that the username field is autofilled correctly, but the password field is not autofilled.
Interestingly, if you manually type the username instead of autofilling it, then you are able to autofill the password. This is probably how I did it in my first test.