Thanks to reading this post to clarify KB5034765 causing windows taskbar flickering dis-appeared & re-appeared since my beta updated on Feb 27, it turns out I'm not the only victim to get this nightmare caused by windows broken update
That is the reason why when I installing window update to 2...
I got the same problem after updating to build 469 then I tried follow Fix No.1, 2 & 4 then Windows Spotlight reworked ;)
https://thegeekpage.com/spotlight-pictures-are-not-changing/