Hi @Gong, I can confirm the flag can help with Xcode 13.2.1 and earlier version.
And Xcode 13.3 has the fix.
My demo project: https://github.com/imWildCat/GetOpaqueTypeMetadataSwiftUICrash
WildCat
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Submitted a feedback: FB9095334
Safari Version 13.1.1 (15609.2.9.1.2)
I am using Xcode 11 to run and debug instead of Xcode 12
As for my case, putting navigationBarTitle after navigationBarItems can reslove this bug.Update: this cannot fix this bug.