Allright, so the problem seems to come up if I use the fix for the new version. I redownloaded the game, the Lust - Pride convo still put me on a bug screen that couldn't be ignored just rollbacked.
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Then I copied the files from the fix, but whenever there wasn't a banner of someone in a conversation, only a narration or the next box coming, Lust's face pops up everytime. It seems now I don't have anymore bugs from Renpy, neither the screwed up renders between the convo with the Archmage, Demon Hunter, Bredita and Katarro, but it's maybe thanks to the fact that I played it to the end from that scene without the fix first. Otherwise it had a bug that had to be ignored before the Horror fight, as well, then after I was brought to the disguised Lust.