The event was also the seventh round of 2023 TCR South America Touring Car Championship.
Enrique Maglione retired in pit lane with damage to the front of his car, with Santiago Urrutia also stopping on track.
After 10 minutes, Azcona closed on Huff, while Michelisz and Girolami both overtook Ehrlacher, with the Lynk & Co driver struggling with tyre choice.
Huff's teammate Frederic Vervisch pulled into the pit lane under the SC conditions with visible damage to his Audi, after colliding with Juan Ángel Rosso.
The race was restarted for one lap, with Huff making a mistake and going wide in one corner and dropping to 3rd, behind both BRC Hyundai cars.