Thanks for the details!!!
Having CapacitorHttp enabled intercepts all requests and sends them through native land so that is why you wouldn’t see it in DevTools. It should only be used if you don’t control the server you are trying to connect to and you cannot configure CORS. It was primarily created to support 3rd Party services that do not allow a localhost or capacitor origin. Running requests through native land completely removes CORS as it doesn’t exist there. But, it does add some overhead as every request/response has to be serialized/deserialized between native land and the web layer. Hence, not recommended if you don’t absolutely need it.
In regards to this new error, I don’t see http://192.168.0.248:3000 in your Ruby CORS config.