Is it normal to hear crickets a month after a 4-hour interview on-site and case study presentation?

Basically the title. I recently went through an extensive interview process for a Manager-level PM role at a large publicly traded company (Fortune 500, 100K+ employees). Applied, and was referred by a friend. Hiring manager gets my resume and calls me next day, and I was moved forward by the recruiter. Had an initial phone screen, then was given a case study assignment to prepare and present. Went onsite for a half-day of back-to-back interviews \- 30 min with a VP of Marketing (behavioral) \- 30 min with a VP of Revenue (behavioral) \- 30 min with the hiring manager, a Senior Director (case study presentation + discussion) \- 30 min virtual with a peer on the team During the hiring manager's session, an EVP from revenue joined unannounced to watch my presentation and asked detailed follow-up questions. After the interviews, the hiring manager gave me a tour of the facility and casually discussed schedule flexibility and working hours. The recruiter told me the hiring manager was hoping to make a decision by end of the month / first week of the following month, and that there was one more candidate to interview. I sent a thank-you email to the hiring manager that same week. Then followed up with the recruiter at the one-week mark. Got a response confirming the timeline. Followed up again when the window passed. No response. Followed up one more time the following week. No response. Four weeks after my onsite, I discovered the job posting now says "position filled” but never got a rejection email. No phone call. Nothing. I emailed the hiring manager directly to confirm and ask for feedback. Still waiting on that. Is this normal at large corporations? I invested significant time preparing and presenting a full case study, took a day for the onsite, and went through four separate interviews. I would have appreciated even a one-line email saying they went another direction. For context, I have 10+ years of experience in this space and felt the interviews went genuinely well based on the signals during the process. Has anyone else experienced this? How did you handle it?