Steps to reproduce:

1. zabbix-docker Git repository currently at version 7.0.8, that was earlier upgraded from version 6.x
2. Stash local changes in the repository for MySQL credentials and HTTPS certificates
3. Checkout 7.4 branch and pull
4. Unstash local changes
5. `docker compose pull`
6. `docker compose down`
7. `docker compose up -d`
8. Fix DB authentication as described in https://github.com/zabbix/zabbix-docker/issues/1749 (add `--mysql-native-password=ON` to `compose_databases.yaml`)
9. Restart container for a clean start
10. In the "Trigger overview" widget on the frontend, click an existing problem and select "Update problem"

Result:
Error message 'Field "eventids" is mandatory.' appears:

Expected:
The "Update problem" dialog appears, which can still be accessed using other widgets, like the "Update" button in the "Problems" widget.