### Godot version

v4.1.dev.custom_build [a8453cb33]

### System information

Windows 11, Core i5-12400F, RX 6600

### Issue description

in recent custom 4.1 builds it is regening every ext id on every save even if just one simple file

	[gd_scene load_steps=2 format=3 uid="uid://bj3w1run711x7"]

	[ext_resource type="Texture2D" uid="uid://c082xolc76p8n" path="res://icon.svg" id="1_ftki2"]

	[node name="Node2D" type="Node2D"]

	[node name="Sprite2D" type="Sprite2D" parent="."]
	position = Vector2(351, 294)
	texture = ExtResource("1_ftki2")

can use a script like this save all files and regen all ext ids in project

	@tool
	extends EditorScript

	func listFiles(path: String, extensions: Array = []) -> Array:
		var list := []
		for dir in DirAccess.get_directories_at(path):
			if not dir.begins_with("."):
				list.append_array(listFiles(path + dir + "/", extensions))
		for file in DirAccess.get_files_at(path):
			var ext := file.split(".")[-1]
			if not file.begins_with(".") and ext != "import":
				if extensions.is_empty() or ext in extensions:
					list.append(path + file)
		return list

	func _run() -> void:
		for file in listFiles("res://", ["tscn", "tres"]):
			ResourceSaver.save(load(file))

in 4.0.2 this script does not regen every ext id in the project each time it is run (just when needed) but in latest 4.1 it does
but just ctrl+s works'nt too

thanks

thought it was related to this but maybe not
https://github.com/godotengine/godot/issues/76693

### Steps to reproduce

- make new scene with ext resource (new control, new sprite, set texture to icon)
1 - save, stage changes
2 - goto 1

or can use script on any project to see that it applies to everything, everywhere, all at once


### Minimal reproduction project

n/a
return resource;
}
Error ResourceLoaderText::_parse_sub_resource_dummy(DummyReadData *p_data, VariantParser::Stream *p_stream, Ref<Resource> &r_res, int &line, String &r_err_str) {
	VariantParser::Token token;
	VariantParser::get_token(p_stream, token, line, r_err_str);
	if (token.type != VariantParser::TK_NUMBER && token.type != VariantParser::TK_STRING) {
		r_err_str = "Expected number (old style) or string (sub-resource index)";
		return ERR_PARSE_ERROR;
	}
	if (p_data->no_placeholders) {
		r_res.unref();
	} else {
		String unique_id = token.value;
		if (!p_data->resource_map.has(unique_id)) {
			r_err_str = "Found unique_id reference before mapping, sub-resources stored out of order in resource file";
			return ERR_PARSE_ERROR;
		}
		r_res = p_data->resource_map[unique_id];
	}
	VariantParser::get_token(p_stream, token, line, r_err_str);
	if (token.type != VariantParser::TK_PARENTHESIS_CLOSE) {
		r_err_str = "Expected ')'";
		return ERR_PARSE_ERROR;
	}
	return OK;
}
Error ResourceLoaderText::_parse_ext_resource_dummy(DummyReadData *p_data, VariantParser::Stream *p_stream, Ref<Resource> &r_res, int &line, String &r_err_str) {