BG96: send AT+COPS=1 returned CME ERROR 30

When I set an operator with AT+COPS=1 (manual operator selection), CME ERROR: 30 is returned.

The NETLIGHT LED is off longer than it is on, so it is not connected to the specified operator.

However, after a while, the NETLIGHT LED is on longer than it is off.

When I send AT+COPS?, it is connected to the operator specified with AT+COPS=1.

Question:
If I send AT+COPS=1, will it still try to connect to the specified operator even if CME ERROR:30 is returned?