Hi, I have the similar problem on AndroidOS. The user name is entered correctly, but the password is not copied to the clipboard. also using another browser does not solve the problem. Maybe I can answer the above questions:
yes, "copied to clipboard" is shown (but is not done)
the content of the clipboard is the "old" content, this means the string that is in the clipboard before "copied to clipboard" is shown is still in the clipboard
no other apps
thanks for your support