When on any of the "Fill in fields Individually" connection method screen, and a field is changed, the "You have unsaved changes.[discard]" message appears. If you change any field to X, then change the option back to the original option, the message remains on the screen. The expectation is that there are no net changes.

It looks like any field option that is changed is set as a flag (in the code), but perhaps the original and new values should be compared instead.