### 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;
	theme_font_size_override.erase(p_name);
	_notify_theme_override_changed();
}
void Window::remove_theme_color_override(const StringName &p_name) {
	ERR_MAIN_THREAD_GUARD;
	theme_color_override.erase(p_name);
	_notify_theme_override_changed();
}
void Window::remove_theme_constant_override(const StringName &p_name) {
	ERR_MAIN_THREAD_GUARD;
	theme_constant_override.erase(p_name);
	_notify_theme_override_changed();
}
bool Window::has_theme_icon_override(const StringName &p_name) const {
	ERR_READ_THREAD_GUARD_V(false);
	const Ref<Texture2D> *tex = theme_icon_override.getptr(p_name);
	return tex != nullptr;
}
bool Window::has_theme_stylebox_override(const StringName &p_name) const {
	ERR_READ_THREAD_GUARD_V(false);
	const Ref<StyleBox> *style = theme_style_override.getptr(p_name);
	return style != nullptr;
}
bool Window::has_theme_font_override(const StringName &p_name) const {