Thanks for contacting us and for the screenshots.
We are aware of this code analysis lapse and we have a pending item for it.
When installing JustCode it turns off the VS underlining settings because we offer the same feature. Unfortunately, we have missed this error in our analysis. If you still want to see both JustCode and VS underlinings you will have to enable them from VS Options.
the Telerik team
Share what you think about JustCode with us, so we can help you even better! You can use the built-in feedback tool inside JustCode, our forum
, or our JustCode