Meta Research Scientist interview questions

A recruiter reached out to me. I had one screening interview that went well. After the interview, recruiter asked me to fill out a form about my immigration status (I was on a student visa with 2+ years of work authorization after my graduation). After that they asked me to fill out an additional questionnaire tailored for O-1 visa. All this legal back and forth took approximately a week. After that I got rejected without any explanation of the reasons.