No specific error. After performing emergency restore of a container ArcMC node view of said container still shows the previous connectors associated to it.
This because the certificate needs to be registered.
You will notice when showing the list of managed containers, those that were recently emergency restored, the "issues" column will show "certificate mismatch"
The certificate mismatch is the root cause for ArcMC not refreshing the connector information.
For the container that is displaying "certificate mismatch"
Select Action : download Certificates
Once completed you will find the container that was "emergency restored" to be empty and ready to have connectors added to it.