LayoutIndexImport.update is not a function

I am having problems creating a file-based routing setup using the Vite plugin for TanStack Router. I am getting an error I am not sure how to solve:

routeTree.gen.ts:35 Uncaught TypeError: LayoutIndexImport.update is not a function
    at routeTree.gen.ts:35:44

routeTree.gen.ts:35 Uncaught TypeError: LayoutIndexImport.update is not a function
    at routeTree.gen.ts:35:44

Reviewing

routeTree.gen.ts

routeTree.gen.ts

in my editor shows me the following error. I am not sure if it's related (see picture).

Any ideas?

Sandbox: https://codesandbox.io/p/github//tanstack-router-test/main