Overriding swap interval for Wayland EGL windows doesn't work

#include <QtWidgets>

int main (int argc, char** argv) {
  QApplication app(argc, argv);
  QSurfaceFormat fmt = QSurfaceFormat::defaultFormat();
  fmt.setSwapInterval(0);
  QSurfaceFormat::setDefaultFormat(fmt);
  QWidget widget;
  widget.show();
  qWarning() << widget.windowHandle()->format().swapInterval();
  return app.exec();
}