This is 23 minutes long but TLDW is that the archived script at the WGA Library shows Dany accidentally setting off wildfire caches around King's Landing.
Could have led in a variety of directions from here (CERSEI's caches, or the Mad Kings? Smear Campaign to paint her as evil? Does she embrace that or try to fight it?) but then they decided against it for whatever reason.
But at the end of the day this might have only saved Dany and maybe CERSEI from the shit show that was S8
EDIT:
Another thing this channel owner has deduced from commentary tracks is that Emilia Clarke was kept in the dark about the fate of Dany for as long as possible, with them filming random footage to try and keep her from knowing what was actually going on (And she may even had read this wildfire version of the script and later been blinded by Dany's actual fate)
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