[jbaudanza]

From the useMemo docs: https://reactjs.org/docs/hooks-reference.html#usememo

You may rely on useMemo as a performance optimization, not as a semantic guarantee. In the future, React may choose to “forget” some previously memoized values and recalculate them on next render, e.g. to free memory for offscreen components. Write your code so that it still works without useMemo — and then add it to optimize performance.

I think about this section a lot. If they actually changed useMemo to sometimes "forget" values, it would break so many useEffect dependency arrays (including my own).