### Godot version

4.1 dev2, 4.0.3

### System information

Windows 10, ryzen 5900x, radeon 6950xt (driver: 23.2.2)

### Issue description

There are two bugs:
- When I create a new node, it is created outside of the viewport. (as in first video)
- When I run the project, all the content inside the viewport dont appear. (as in second video)
I believe the second issue is related to the first.

Note: these problems are in RTL editors.

https://github.com/godotengine/godot/assets/121864036/84f0d434-0d1b-4c23-9fb0-510257e2e191


https://github.com/godotengine/godot/assets/121864036/b2bc20c7-1e2e-4d04-99e7-d66860ffced2




### Steps to reproduce

Videos explain.

### Minimal reproduction project

N/A
ERR_READ_THREAD_GUARD_V(Size2());
	return data.custom_minimum_size;
}
void Control::_update_minimum_size_cache() {
	Size2 minsize = get_minimum_size();
	minsize.x = MAX(minsize.x, data.custom_minimum_size.x);
	minsize.y = MAX(minsize.y, data.custom_minimum_size.y);
	bool size_changed = false;
	if (data.minimum_size_cache != minsize) {
		size_changed = true;
	}
	data.minimum_size_cache = minsize;
	data.minimum_size_valid = true;
	if (size_changed) {
		update_minimum_size();
	}
}
Size2 Control::get_combined_minimum_size() const {
	ERR_READ_THREAD_GUARD_V(Size2());
	if (!data.minimum_size_valid) {
		const_cast<Control *>(this)->_update_minimum_size_cache();
	}
	return data.minimum_size_cache;
}
void Control::_size_changed() {