Delphi 12 Athens Child Form Flickering

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After updating to the new version of Delphi in RAD Studio 12 Athens, child VCL Forms are flickering in the Form activation event.

Does any one knows the reason?

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You just need to put this code after Application.Initialize:

TStyleManager.ChangeChildFormSystemBorder:=False;

Embarcadero describes this new option:

Child forms can now have a new modern flat border (the new property is TStyleManager.ChangeChildFormSystemBorder)