OSConfig troubleshoot fails at connection check if Cloud NAT is used

I have additionally enabled Private Google Access in target subnet (even though it highlight that CloudNAT is compensates that), didn't help.

> Is the OS Config API enabled? Yes
> Is the OS Config agent enabled? Yes
> Is the OS Config agent up to date? Yes
> Is a service account present on the instance? Yes
> Is the OS Config Service account present for this instance? Yes
> Does this instance have a public IP or Private Google Access? No

Start by reproducing the OSConfig troubleshoot connection check on an instance using Cloud NAT, with and without Private Google Access, and compare the reported result with the configured network path. Review the connection-check logic and its network prerequisites; done means the check correctly handles Cloud NAT or clearly reports the required configuration.

Written by the indexing model from the issue text.