See this reproduction: https://stackblitz.com/edit/tanstack-router-mbfafp?file=src%2Fmain.tsx
Even if I have no loader specified, the defaultPendingComponent is briefly rendered, and thus sometimes visible. This becomes more obvious when defaultPendingMs is set to zero - we will see the (unnecessary) pending component for half a second (the default of defaultPendingMinMs)
I think the pending component should only be rendered for routes that have a loader, right?