I had to go back and rewatch the Final Fantasy V run and that was... a confluence of circumstances indeed.
First the runner had a character dead at the end of a fight off-route, and figured they could make up the missing AP from a battle that turned out to not give AP but that never mattered in the past. They realized they were still off AP route at a point where no battles were available, at a funnel to a boss that just happened to hard-require the one ability they were missing due to the AP shortfall.
They routed around the shortfall and got a battle route that worked, only to find a bug exclusive to the Pixel Remaster of FFV that made that particular strategy in that battle cause the boss to glitch and auto-heal itself to full. Again, not relevant to any known play configuration so not known or thought about until now.
What a ride.
@noiob Yeah. They spent 20 minutes on that boss trying to re-route on the fly. One of the commentators had AI script dumps from the FF wiki open on his tablet trying to figure out how to win. They eventually got it and were able to correct the route divergence.