FMX Styles are not applied


Using Delphi 10.4 Version 27.0.40680.4203 (Sidney), I edited the default style for TButtons, TLabels, and TEdit boxes. My form at design time looks like this:

When I compile and run the application (Target Platform: Windows 32-bit) on Windows 10/64-bit, I get this:

That is, button and label styles are applied, but the edit boxes have all but disappeared – the style seems to not have been applied.
Reloading the project or restarting Delphi/RAD Studio makes no difference. I saved the style sheet to a .style file and reloaded it into a new Stylebook – no joy.
Any ideas why it shows up correctly at design time but not at run-time, and what I can do about it?

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