Resolve Cloud Run Route 404

My web application runs on Google Cloud Run and, overall, behaves as expected—except for one stubborn route that keeps returning a 404. The rest of the site renders fine, so I’m convinced this isn’t simply a deployment-gone-wrong... (Budget: $8 - $15 USD, Jobs: API Development, Cloud Computing, Containerization, Continuous Integration, DevOps, Google Cloud Platform, Microservices, Terraform, Troubleshooting, Web Application)