I was able to reproduce the error.

When I convert a project with no authentication type, it works. 

When I convert a project with Microsoft Identity Platform, I see the error. 

An error occurred while running the wizard.

Error executing custom action Telerik.Blazor.VSX.Actions.UpdateMasterPageAction: System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
   at System.ThrowHelper.ThrowKeyNotFoundException()
   at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
   at Telerik.Blazor.VSX.Actions.UpdateMasterPageAction.RetrieveMasterPageSettingsUpgradeInfo(IPropertyDataDictionary arguments, IProjectWrap project)
   at Telerik.Blazor.VSX.Actions.UpdateMasterPageAction.Execute(WizardContext wizardContext, IPropertyDataDictionary arguments, IProjectWrap projectWrap)
   at Telerik.VSX.WizardEngine.ActionManager.ExecActions()