[UWP] weird focus at app open every time in Win11 22621

Question

hi MSFT

I build a c++ UWP app like :

it's run well on Win10/W11 22000.

recently , test on Win11 22612 RTM, UWP not change a code,
found that always focus at my 1st checkbox every launch,
pretty sure keyboard tab was not clicked

also check my code that doesn't any part for focus,
even rebuild UWP with SDK 22621, still has the issue.

how can I investigate this?

PS: C++/CX UWP, vs2017