Brookings Institution interview questions

I applied for the role at the end of February. I heard back around two weeks later (early/mid-March). The recruiter wanted to schedule a screening call with me, which I scheduled for 3 days later. On the day of my screening, I did not get a call from my recruiter at the time scheduled so I emailed them. They said they did call me, but it never showed up on my call log. Anyway, we were able to resolve that matter minutes later, although the recruiter did sound a bit annoyed on call (I may have overthought it). I was asked typical screening questions (strengths/weaknesses/why us and this role). I did not hear back until almost 4 weeks later (did not move forward). And this was with me sending a weekly follow-up email after the screening. They might have still be doing screenings during the that time, but I also feel like... 4 weeks of silence? Come on...

Phone screen, then a mock assignment (qualitative and quantitative research) plus a small group interview and a final round of interviews (three one-on-one conversations). The first interview was with two people on the team, and the second included conversations with staff of varying seniority