Adam B. Vary Senior Entertainment Writer Victoria Alonso’s work as a producer of the Oscar-nominated feature film “Argentina, 1985” is coming under greater scrutiny as a major factor in Disney’s decision to fire the longtime Marvel Studios executive for cause, according to three sources with knowledge of Alonso’s exit. At issue, according to these sources, was Alonso’s 2018 employment contract with Disney that prohibited her from working on projects for any rival studios. “Argentina, 1985” — which tracks the real-life trials of the country’s final dictatorship — was produced in part by Amazon Studios, which released the film on Prime Video in October. But Alonso, who was born and raised in Argentina, did not alert Disney to her work on “Argentina, 1985” in advance, sources say.