'imports' is only valid on a component that is standalone

I updated my Angular 18 applications (with standalone components standalone: true) to Angular 19 using ng update:

❯ Updates non-standalone Directives, Component and Pipes to 'standalone:false' 
  and removes 'standalone:true' from those who are standalone.

So far so good, all standalone: true are removed.

However, Visual Studio Code is now issuing following error for imports: [RouterLink, ...]:

'imports' is only valid on a component that is standalone.

What did I miss?

I followed this guide:

• https://angular.dev/update-guide?v=18.0-19.0

Either restarting VS Code, updating angular language service as mentionened here,

but if that doesn't solve the issue and you have a workspace containing multiple different angular projects, try to make a clean workspace containing only v19 projects.