All assets that are created in between start- and stop-asset editing are not fully imported before the call to StopAssetEditing.
This is by design.
If certain asset database API's are called before the call to StopAssetEditing and with assets that are not yet fully imported, you will experience unexpected behavior.
An update to the documentation for StartAssetEditing and StopAssetEditing has been submitted as a response to this bug.