### 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_READ_THREAD_GUARD_V(false);
	String sname = p_name;
	if (!sname.begins_with("theme_override")) {
		return false;
	}
	if (sname.begins_with("theme_override_icons/")) {
		String name = sname.get_slicec('/', 1);
		r_ret = theme_icon_override.has(name) ? Variant(theme_icon_override[name]) : Variant();
	} else if (sname.begins_with("theme_override_styles/")) {
		String name = sname.get_slicec('/', 1);
		r_ret = theme_style_override.has(name) ? Variant(theme_style_override[name]) : Variant();
	} else if (sname.begins_with("theme_override_fonts/")) {
		String name = sname.get_slicec('/', 1);
		r_ret = theme_font_override.has(name) ? Variant(theme_font_override[name]) : Variant();
	} else if (sname.begins_with("theme_override_font_sizes/")) {
		String name = sname.get_slicec('/', 1);
		r_ret = theme_font_size_override.has(name) ? Variant(theme_font_size_override[name]) : Variant();
	} else if (sname.begins_with("theme_override_colors/")) {
		String name = sname.get_slicec('/', 1);
		r_ret = theme_color_override.has(name) ? Variant(theme_color_override[name]) : Variant();
	} else if (sname.begins_with("theme_override_constants/")) {
		String name = sname.get_slicec('/', 1);
		r_ret = theme_constant_override.has(name) ? Variant(theme_constant_override[name]) : Variant();
	} else {
		return false;
	}
	return true;
}
void Window::_get_property_list(List<PropertyInfo> *p_list) const {