### 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);
	const Ref<Font> *font = theme_font_override.getptr(p_name);
	return font != nullptr;
}
bool Window::has_theme_font_size_override(const StringName &p_name) const {
	ERR_READ_THREAD_GUARD_V(false);
	const int *font_size = theme_font_size_override.getptr(p_name);
	return font_size != nullptr;
}
bool Window::has_theme_color_override(const StringName &p_name) const {
	ERR_READ_THREAD_GUARD_V(false);
	const Color *color = theme_color_override.getptr(p_name);
	return color != nullptr;
}
bool Window::has_theme_constant_override(const StringName &p_name) const {
	ERR_READ_THREAD_GUARD_V(false);
	const int *constant = theme_constant_override.getptr(p_name);
	return constant != nullptr;
}
float Window::get_theme_default_base_scale() const {
	ERR_READ_THREAD_GUARD_V(0);
	return theme_owner->get_theme_default_base_scale();
}
Ref<Font> Window::get_theme_default_font() const {
	ERR_READ_THREAD_GUARD_V(Ref<Font>());
	return theme_owner->get_theme_default_font();
}
int Window::get_theme_default_font_size() const {