title: Razor Component not rendering
body: <p>I have a simple Razor component. The application builds but when I run it, there is nothing shown.</p>
  <p>The Razor component (SystemNameLookup.razor) is</p>
  <pre><code>@inherits SystemNameLookupComponent
  &lt;h3&gt;Hi @SystemName&lt;/h3&gt;
  </code></pre>
  <p>and the code behind is</p>
  <pre><code>namespace WebApp.Pages.Shared.Components
  {
      public class SystemNameLookupComponent : ComponentBase
      {
          [Parameter]
          public string SystemName { get; set; } = &quot;Something&quot;;
      }
  }
  </code></pre>
  <p>and it is called as</p>
  <pre><code>&lt;SystemNameLookup&gt;&lt;/SystemNameLookup&gt;
  </code></pre>
  <p>_Imports.cshtml contains</p>
  <pre><code>@using Microsoft.AspNetCore.Components
  @using WebApp.Pages.Shared.Components
  </code></pre>
  <p>and _ViewImports.cshtml contains</p>
  <pre><code>@using WebApp
  @using WebApp.Pages.Shared.Components
  @namespace WebApp.Pages
  </code></pre>
  <p>But nothing appears! What am I missing? (No errors reported -this was run on ASP.Net Core 5)</p>