Recently I discovered unofficial Fallout 2 patch made by Killap which removes most bugs occuring in Fallout 2 version 1.02 (like some problems with gaining most "Idolized" reputations and Cassidy's battle settings are constantly reseting). And yes, it also help to achieve the best endings normally unavailable due to scripts bugs. Unfortunately I could not achieve Vault 13 best ending, because you have only 14 days to kill Dr. Schreber before intelligent death claws will be exterminated (however you can avoid bad ending if you not enter Vault 13 again).
This New Reno ending you can achieve only if you play as male character, and you had sex with Mrs. Bishop or Angela Bishop, however later in Fallout: New Vegas this ending is considered as canon. If you play as female character other New Reno canon endings are if you leave Bishop or Wright family in charge but don't make all of their quests (like silently eliminate Roger Westin in NCR and enter Sierra Army Depot), and eliminate Salvatore and Mordino families. All about Fallout 2 endings you can read here: https://fallout.fandom.com/wiki/Fallout_2_endings.
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