2.0.0-rc.7 spooky action at a distance because of lazy latest computed creation

[GabbeV]

Describe the bug

When the latest computed is created gives observably different results

Your Example Website or App

https://s.olid.uk/id/G2XqVdW-Sc6GZHWLXyJvWg

Steps to Reproduce the Bug or Issue

1. Open repro
2. Click button
3. Observe that A shows 0 and B shows 1 when the only difference between them is a unobserved memo reading latest of B

Expected behavior

latest computed being lazily created should be an implementation detail meaning signals should maintain enough state to be able to initialize it to the value it would have had if it existed from the beginning.

Screenshots or Videos

No response

Platform

• OS: Windows
• Browser: Firefox

Additional context

No response

[GabbeV]

Same issue but for stores but A and B flips for some reason https://s.olid.uk/id/VjUyuR9LSOek8dwOWGdHnw