systemctl blocking on starting non-postgres-owned clusters

Jan 13 13:04:14 tilt systemd[1]: Starting PostgreSQL Cluster 11-hello2...
Jan 13 13:04:17 tilt systemd[1]: postgresql@11-hello2.service: Can't open PID file /run/postgresql/11-hello2.pid (yet?) after start: No such file or directory

Spotted by #postgresql user rendar.