Client side navigation does not render a page

/routes/items/(view-item).tsx

function SidebarLink(props) {
  return <A href={props.href}>{props.children}</A>
}

function Sidebar() {
  // simplified version
  return <ul>
    <li><SidebarLink href="/items">Items</SidebarLink></li>
    <li><SidebarLink href="/users">Users</SidebarLink></li> {/* this page does not exist on purpose */}
  </ul>
}