### Godot version

v4.0.beta.custom_build [fab9926a9]

### System information

Fedora 37

### Issue description

When creating a new inherited scene, saving the scene (for example with Ctrl+S) defaults to overwriting the scene being inherited, instead of prompting for a location to save to.

### Steps to reproduce

1. Create a new inherited scene
2. Press Ctrl+S

If the scene being inherited is imported (for example from a glTF), an error displays. If the inherited scene is a .tscn or .scn, it gets overridden by an inherited scene that tries to inherit itself, which is impossible and thus corrupt.

### Minimal reproduction project

N/A
tabbar_container->add_child(scene_tabs);
	scene_tabs_context_menu = memnew(PopupMenu);
	tabbar_container->add_child(scene_tabs_context_menu);
	scene_tabs_context_menu->connect("id_pressed", callable_mp(this, &EditorNode::_menu_option));
	scene_tab_add = memnew(Button);
	scene_tab_add->set_flat(true);
	scene_tab_add->set_tooltip_text(TTR("Add a new scene."));
	scene_tab_add->set_icon(gui_base->get_theme_icon(SNAME("Add"), SNAME("EditorIcons")));
	scene_tab_add->add_theme_color_override("icon_normal_color", Color(0.6f, 0.6f, 0.6f, 0.8f));
	scene_tabs->add_child(scene_tab_add);
	scene_tab_add->connect("pressed", callable_mp(this, &EditorNode::_menu_option).bind(FILE_NEW_SCENE));
	scene_tab_add_ph = memnew(Control);
	scene_tab_add_ph->set_mouse_filter(Control::MOUSE_FILTER_IGNORE);
	scene_tab_add_ph->set_custom_minimum_size(scene_tab_add->get_minimum_size());
	tabbar_container->add_child(scene_tab_add_ph);
	distraction_free = memnew(Button);
	distraction_free->set_flat(true);
	ED_SHORTCUT_AND_COMMAND("editor/distraction_free_mode", TTR("Distraction Free Mode"), KeyModifierMask::CTRL | KeyModifierMask::SHIFT | Key::F11);
	ED_SHORTCUT_OVERRIDE("editor/distraction_free_mode", "macos", KeyModifierMask::META | KeyModifierMask::CTRL | Key::D);
	distraction_free->set_shortcut(ED_GET_SHORTCUT("editor/distraction_free_mode"));
	distraction_free->set_tooltip_text(TTR("Toggle distraction-free mode."));
	distraction_free->connect("pressed", callable_mp(this, &EditorNode::_toggle_distraction_free_mode));
	distraction_free->set_icon(gui_base->get_theme_icon(SNAME("DistractionFree"), SNAME("EditorIcons")));
	distraction_free->set_toggle_mode(true);
	tabbar_container->add_child(distraction_free);
	scene_root_parent = memnew(PanelContainer);
	scene_root_parent->set_custom_minimum_size(Size2(0, 80) * EDSCALE);
	scene_root_parent->add_theme_style_override("panel", gui_base->get_theme_stylebox(SNAME("Content"), SNAME("EditorStyles")));
	scene_root_parent->set_draw_behind_parent(true);
	srt->add_child(scene_root_parent);