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