### Godot version

4.0.dev

### System information

win11，core i7 13700,  GTX4090

### Issue description

Just look at this gif.

![screenshots](https://user-images.githubusercontent.com/1620585/225354749-6ea17059-95b2-45e0-9765-8505e92726eb.gif)

It seems that it was block by Static Type Checking.

![image](https://user-images.githubusercontent.com/1620585/225362874-507ff0ec-c6d8-4a25-9a16-89db1885ad02.png)

If it's right.

Why it doesn't just disable other option except for String and StringName?

### Steps to reproduce

1. first select string type
2. input a text
3. change type
4. change back to string  -- it don't work
5. change to stringname -- it works
6. change back to string -- it works

### Minimal reproduction project

I think it don't need reproduction project.
animation = p_animation;
	read_only = p_read_only;
	track = p_track;
	queue_redraw();
	ERR_FAIL_INDEX(track, animation->get_track_count());
	node_path = animation->track_get_path(p_track);
	type_icon = _get_key_type_icon();
	selected_icon = get_theme_icon(SNAME("KeySelected"), SNAME("EditorIcons"));
}
NodePath AnimationTrackEdit::get_path() const {
	return node_path;
}
Size2 AnimationTrackEdit::get_minimum_size() const {
	Ref<Texture2D> texture = get_theme_icon(SNAME("Object"), SNAME("EditorIcons"));
	Ref<Font> font = get_theme_font(SNAME("font"), SNAME("Label"));
	int font_size = get_theme_font_size(SNAME("font_size"), SNAME("Label"));
	int separation = get_theme_constant(SNAME("v_separation"), SNAME("ItemList"));
	int max_h = MAX(texture->get_height(), font->get_height(font_size));
	max_h = MAX(max_h, get_key_height());
	return Vector2(1, max_h + separation);
}
void AnimationTrackEdit::set_timeline(AnimationTimelineEdit *p_timeline) {
	timeline = p_timeline;
	timeline->set_track_edit(this);
	timeline->connect("zoom_changed", callable_mp(this, &AnimationTrackEdit::_zoom_changed));
	timeline->connect("name_limit_changed", callable_mp(this, &AnimationTrackEdit::_zoom_changed));
}
void AnimationTrackEdit::set_editor(AnimationTrackEditor *p_editor) {