### 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
if (theme_icon_override.has(dname)) {
				theme_icon_override[dname]->disconnect_changed(callable_mp(this, &Window::_notify_theme_override_changed));
			}
			theme_icon_override.erase(dname);
			_notify_theme_override_changed();
		} else if (name.begins_with("theme_override_styles/")) {
			String dname = name.get_slicec('/', 1);
			if (theme_style_override.has(dname)) {
				theme_style_override[dname]->disconnect_changed(callable_mp(this, &Window::_notify_theme_override_changed));
			}
			theme_style_override.erase(dname);
			_notify_theme_override_changed();
		} else if (name.begins_with("theme_override_fonts/")) {
			String dname = name.get_slicec('/', 1);
			if (theme_font_override.has(dname)) {
				theme_font_override[dname]->disconnect_changed(callable_mp(this, &Window::_notify_theme_override_changed));
			}
			theme_font_override.erase(dname);
			_notify_theme_override_changed();
		} else if (name.begins_with("theme_override_font_sizes/")) {
			String dname = name.get_slicec('/', 1);
			theme_font_size_override.erase(dname);
			_notify_theme_override_changed();
		} else if (name.begins_with("theme_override_colors/")) {
			String dname = name.get_slicec('/', 1);
			theme_color_override.erase(dname);
			_notify_theme_override_changed();
		} else if (name.begins_with("theme_override_constants/")) {
			String dname = name.get_slicec('/', 1);
			theme_constant_override.erase(dname);