With the wildcard IP range
0.0.0.0/0 removed from the list of Trusted IP ranges, I can no longer access the app from a Salesforce IP address.
The platform doesn't assign any IP address ranges, even those for Salesforce, other than
0.0.0.0/0, to the list of Trusted IP ranges. Please manually add the IP address ranges for the hosts that need access to the apps in the Private Space.