`watchEffect` within a Setup Store is stopped unexpectedly

[0x009922]

Reproduction

https://stackblitz.com/edit/github-u4jlt8

Steps to reproduce the bug

1. Click "Negate store.flag" buttonn any times you like. You will see how store.flag negates, ang how its computed store.negated stays reactive.
2. Uncheck "Show StoreUser" input. The component will be unmounted.
3. Check it again, to mount the component back.
4. Click "Negate" button again - store.negated is not reactive anymore.

Screen.Recording.2022-12-11.at.14.02.35.mov

Expected behavior

I expected the watchEffect(), called within a Setup Store, to be active as long as the store's scope is active. It makes possible for utilities like computedEager() just work in setup stores.

Actual behavior

The watch effect seems to bind not to the store's setup scope, but to the component where the initial useStore invocation happened. Thus, when the component is unmounted, the watch effect is cleared and stopped, leaving the store in a broken and hard-to-debug state.

Additional information

No response

[posva]

Created vuejs/core#7319 to track it