So the point is what was the last take or what was the last song they developed together? I remember reading that the last ever recorded take of Freddie was the middle eight in "Mother Love". The one ending with "Mama please, let me back inside". And that line IMO was not manipulated on MIH, no compression, reverb, or any other effect, just the voice as captured by the mic, which to me is a hint as well.
The lines before that are very high, and as Brian explained, he downed a vodka, and just nailed it. After that he wasn't able to continue and was quoted saying "I'll finish that next time", but never did.
Perhaps AWT was recorded in London later, but apparently ML was the last ever song that at least two members of Queen worked on together.
song "Mother Love" began filming in mid-summer of 1991 and the penultimate stanza Freddie filmed either in October or November 1991 but according to David Richards
penultimate stanza sung 7 November 1991 and then went back to London and never returned to the studio after Freddie's death so he finished the song with brian may band Queen