Error duplicating alerts.

### What happened? When trying to duplicate alerts in the new version of Grafana, it doesn't show an error when redirecting to the new alert page; the same happens with dashboards as well. <img width="1855" height="950" alt="Image" src="https://github.com/user-attachments/assets/37948a97-81f3-463d-be6a-34ecbf5c5f43" /> <img width="1859" height="968" alt="Image" src="https://github.com/user-attachments/assets/5ed52a57-94f0-4c97-9a48-4e8e69df7a13" /> ### What did you expect to happen? The correct behavior would be to redirect to a new page with the same information as the alerts and dashboards I'm duplicating, but it doesn't complete the process. ### Did this work before? Yes, it works normally in versions below 12.3. ### How do we reproduce it? 1. Only attempt to duplicate a complex alert with functions within Grafana OSS in version 12.3 2. It works for simple alerts, but for alerts with additional functions, the error usually occurs. 3. ### Is the bug inside a dashboard panel? The bug is in the Grafana alert tabs, and also in the dashboard tabs when trying to duplicate them. ### Environment (with versions)? Grafana: OSS OS: 12.3+ Browser: Chrome, Firefox, Edge, etc... ### Grafana platform? Kubernetes ### Datasource(s)? Prometheus