Based on the information provided in the question, this seems to the entirely related to ASP.NET Core and how the information is read from the Appsettings.josn.
As the KendoReact team has to control this, I can suggest checking on some of the ASP.NET Core forums, where the community can have faced similar issues.
These are interesting links that could be helpful:
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Feedback Portal
and vote to affect the priority of the items