when keepPreviousData is true, Suspense Fallback just show once

[FanetheDivine]

Bug report

Description / Observed Behavior

keepPreviousData:true, change key, and no Suspense Fallback

Expected Behavior

Fallback can be shown corrently

Repro Steps / Code Example

https://codesandbox.io/p/devbox/exciting-ace-784vcs

Additional Context

SWR 2.3.4