Kiali Weighted Routing Wizard resets VirtualService gateways value

I'm experiencing problems with the Weighted Routing Wizard. Whenever I update the traffic percentage, the gateway value is lost (It actually dissapears from the VirtualService yaml.

Using Kiali 1.12.3 with OCP 4.3, ServiceMesh 1.1.1

The steps to reproduce the issue are the following:

1. Create 2 Deployments that corresponds to 2 different versions of the same app.
2. Create a Service for the app.
3. Create a Gateway.
4. In Kiali, use the Weighted Routing Wizard to distribute traffic between the two versions. Use the gateway created in the previous step. At this point, routing works.
5. In Kiali, use the Weighted Routing Wizard to update traffic portion for each service. This action will remove the "spec.gateways" setting from the VirtualService.