`SidePanel` frame leaks into `BottomPanel` about egui HOT 4 OPEN

impl eframe::App for MyApp {
    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
        egui::CentralPanel::default().show(ctx, |ui| {
            egui::TopBottomPanel::bottom("bottom")
                .resizable(true)
                .show_animated_inside(ui, true, |ui| {
                    egui::ScrollArea::vertical().show(ui, |ui| {
                        for _ in 0..20 {
                            ui.label("bottom panel");
                        }
                    })
                });

            egui::SidePanel::left("left panel")
                .resizable(true)
                .frame(egui::Frame::default())
                .show_separator_line(false)
                .show_animated_inside(ui, true, |ui| {
                    ui.painter()
                        .rect_filled(ui.max_rect(), 0.0, egui::Color32::RED);
                    ui.painter().vline(
                        ui.max_rect().right(),
                        ui.max_rect().y_range(),
                        ui.style().visuals.widgets.noninteractive.bg_stroke,
                    );
                    ui.set_clip_rect(ui.max_rect());

                    for _ in 0..20 {
                        ui.label("left panel");
                    }
                });
        });
    }
}