I’ve restored a 8.3 Gateway in a freshly installed new machine; during the process I selected the option to “Restore Disabled” to allow me to address any problems with the various database and device sources.
The only issue is that apparently the System tag provider is “disabled” and I cannot enable it:
If you look on the Gateway filesystem at $IGNITION/data/config/resources/core/ignition/tag-provider/System/resource.json does the attributes object in that file have a "enabled" : false entry?