### Godot version

2992ffd25523cb8b3e0ef1b873c40115b8940178

### System information

Windows 10

### Issue description

Godot crashes randomly within a few seconds after project start when moving with the mouse.

![win_err](https://github.com/godotengine/godot/assets/52464204/1da28596-d95b-40f3-b32f-12219ec02c5d)

Started after recent merge of https://github.com/godotengine/godot/pull/67791.
I can confirm that reverting the pr fixes the crashes.

### Steps to reproduce

see desc

### Minimal reproduction project

N/A
ERR_MAIN_THREAD_GUARD;
	ERR_FAIL_COND(!p_style.is_valid());
	if (theme_style_override.has(p_name)) {
		theme_style_override[p_name]->disconnect_changed(callable_mp(this, &Window::_notify_theme_override_changed));
	}
	theme_style_override[p_name] = p_style;
	theme_style_override[p_name]->connect_changed(callable_mp(this, &Window::_notify_theme_override_changed), CONNECT_REFERENCE_COUNTED);
	_notify_theme_override_changed();
}
void Window::add_theme_font_override(const StringName &p_name, const Ref<Font> &p_font) {
	ERR_MAIN_THREAD_GUARD;
	ERR_FAIL_COND(!p_font.is_valid());
	if (theme_font_override.has(p_name)) {
		theme_font_override[p_name]->disconnect_changed(callable_mp(this, &Window::_notify_theme_override_changed));
	}
	theme_font_override[p_name] = p_font;
	theme_font_override[p_name]->connect_changed(callable_mp(this, &Window::_notify_theme_override_changed), CONNECT_REFERENCE_COUNTED);
	_notify_theme_override_changed();
}
void Window::add_theme_font_size_override(const StringName &p_name, int p_font_size) {
	ERR_MAIN_THREAD_GUARD;
	theme_font_size_override[p_name] = p_font_size;
	_notify_theme_override_changed();
}
void Window::add_theme_color_override(const StringName &p_name, const Color &p_color) {
	ERR_MAIN_THREAD_GUARD;
	theme_color_override[p_name] = p_color;
	_notify_theme_override_changed();
}
void Window::add_theme_constant_override(const StringName &p_name, int p_constant) {