### Godot version

4.0 dev_build

### System information

Ubuntu 22.04.1

### Issue description

The "Lookup Symbol" button don't appears for custorm class names.
Related issues: #68475,  #73167.
I tried apply #68311, #69473 and #73196. It don't helps.
The `Ctrl+LMB` works right for all cases.

### Steps to reproduce

Right click to the `CustomClassA` symbol in the `custom_class_b.gd` anywhere. The `Lookup Symbol` button don't appears in the context menu.

### Minimal reproduction project

Example from  #68475.
CodeEdit *text_edit = code_editor->get_text_editor();
	Node *base = get_tree()->get_edited_scene_root();
	if (base) {
		base = _find_node_for_script(base, base, script);
	}
	ScriptLanguage::LookupResult result;
	if (ScriptServer::is_global_class(p_symbol) || p_symbol.is_resource_file() || script->get_language()->lookup_code(code_editor->get_text_editor()->get_text_for_symbol_lookup(), p_symbol, script->get_path(), base, result) == OK || (ProjectSettings::get_singleton()->has_autoload(p_symbol) && ProjectSettings::get_singleton()->get_autoload(p_symbol).is_singleton)) {
		text_edit->set_symbol_lookup_word_as_valid(true);
	} else if (p_symbol.is_relative_path()) {
		String path = _get_absolute_path(p_symbol);
		if (FileAccess::exists(path)) {
			text_edit->set_symbol_lookup_word_as_valid(true);
		} else {
			text_edit->set_symbol_lookup_word_as_valid(false);
		}
	} else {
		text_edit->set_symbol_lookup_word_as_valid(false);
	}
}
String ScriptTextEditor::_get_absolute_path(const String &rel_path) {