wxDialog loses stay on top attribute - c++

Question

I have 2 wxDialogs with the button which makes each of them top most dialog(wxSTAY_ON_TOP) after button click.
Workflow:
I make one of them top most, checked - dialog become top most.
I clicked once more and dialog become not top most, checked - ok.
Made both of them top most, checked - ok, both top most.
Made one of them not top most after step 3, checked - accordinly to logs 1 - top most, another is not top most, but if I click somewhere both behaves like not top most. I have tried with wxFrame, with more than 2 wxDialogs - result same. Maybe I missing something or threre is a bug. Please help.
wxWidgets 3.0.2, Windows
Simple frame which owns dialogs
class Frame : public wxFrame
{
public:
Frame()
: wxFrame(nullptr, wxID_ANY, wxEmptyString, wxPoint(1100, 300), wxSize(200, 200))
{
wxBoxSizer* sz = new wxBoxSizer(wxVERTICAL);
wxStaticText* text = new wxStaticText(this, wxID_ANY, "Parent Frame");
sz->Add(text, 0, wxALL, 5);
SetSizer(sz);
Layout();
}
};
Dialog class
class Dialog : public wxDialog
{
public:
Dialog(wxWindow* parent, wxPoint pos)
: wxDialog(parent, wxID_ANY, "", pos, wxSize(200, 200),
wxFRAME_NO_TASKBAR | wxTAB_TRAVERSAL | wxBORDER_NONE)
{
wxBoxSizer* mainS = new wxBoxSizer(wxVERTICAL);
wxButton* button = new wxButton(this, wxID_ANY, "Top Most");
mainS->Add(button, 0, wxALL, 5);
SetSizer(mainS);
Layout();
button->Bind(wxEVT_BUTTON, &Dialog::onButton, this);
}
void onButton(wxCommandEvent&)
{
bool isTopMost = (GetWindowStyle() & wxSTAY_ON_TOP) != 0;
if (isTopMost) {
// Makes not top most dynamically
SetWindowStyle(GetWindowStyle() & ~wxSTAY_ON_TOP);
}
else {
// Makes top most dynamically
SetWindowStyle(GetWindowStyle() | wxSTAY_ON_TOP);
}
}
};
Calling sample
class WxguiApp : public wxApp
{
public:
bool OnInit() override
{
Frame* mainWnd = new Frame();
mainWnd->Show();
SetTopWindow(mainWnd);
Dialog* dlg1 = new Dialog(mainWnd, wxPoint(500, 300));
dlg1->Show();
Dialog* dlg2 = new Dialog(mainWnd, wxPoint(800, 300));
dlg2->Show();
return true;
}
};
IMPLEMENT_APP(WxguiApp);