When I automate the volume-fader to achieve a fadeout at the end of a song, the "Update Loudness" button doesn't turn yellow and isn't clickable. However, when I used to do the fadeout directly on the audio file, that did happen.
When I automate the volume control in the middle of the song, the "Update Loudness" button turns yellow, but is still not clickable, and I am unable to recalculate the LUFS of the song.