Clarify behavior of non stale, cached data on app reopen, after error in queryFn

[sak3th]

Version: 4.2.3

Scenario: Use useQuery to fetch some data with infinite stale and cache time.

• Step 1 - Kill the app and make sure that the queryFn from this moment onwards always errors out.
• Step 2 - Start the app. (queryFn is triggered with useQuery on mount). Data is served from cache as there is an error in the queryFn. Triggering refetch also serves cached data.
• Step 3 - Kill the app and start it again.
• Step 4 - This time cached data is not getting served and data comes as undefined

Question - After Step 3, somehow the cached data was invalidated even though the stale time was set to Infinity. Why is the cache data not being served from 2nd app restart and when is the cache data getting invalidated?

(I tried to get around the problem/behavior by using initialData and initialDataUpdatedAt but was not able to make it work.)

[TkDodo]

You have to be more precise please. Talking about "app" - is this react native? How is data still there after you "killed the app"? So you use persisters?

[sak3th]

Yes. This is react native and we are using persisters.

Let me know if there is any other info required.

[TkDodo]

Yes. A reproduction.