Bug? refetchOnWindowFocus: true always performs fetch

[ffxsam]

The docs (in the source code) say:

    /**
     * If set to `true`, the query will refetch on window focus if the data is stale.
     * If set to `false`, the query will not refetch on window focus.
     * If set to `'always'`, the query will always refetch on window focus.
     * If set to a function, the function will be executed with the latest data and query to compute the value.
     * Defaults to `true`.
     */

However, when this is set to true in production, I noticed that fetches are performed every time I tab out and back into our application.

queryClient.setDefaultOptions({
  queries: {
    placeholderData: (prevData: unknown) => prevData,
    refetchOnWindowFocus: import.meta.env.PROD,
  },
  mutations: {
    retry: 1,
  },
});