Keep me sign in not works anymore after upgrade to IOS 18

I have a product developed base on the WKWebview.
I use Azure as IDP configured for login in. Azure have “keep me sign in” to allow user no need to enter credential again after reopen the app. Every thing works fine in IOS 17. 16. But keep me sign in function not works anymore after upgrade device to IOS 18. User need to enter credential every time after reopen the app.

Is there any thing change in WKWebview in IOS 18?

Keep me sign in not works anymore after upgrade to IOS 18
 
 
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