My app service keeps failing to start because DATABASE_URL is empty at runtime.

I set it as a reference to my Postgres service (${{ Postgres.DATABASE_URL }}), but after deploy it either reverts to an old service ID form (${{ 35678e1c-... }}) or resolves to empty.

Pasting the connection string directly works, so the issue is specifically the reference variable resolution.

I already deleted the project and i already try it from scratch, and same thing.

Thanks!