### 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.
e.column = pe.column;
				e.message = pe.message;
				r_errors->push_back(e);
			}
		}
		return false;
	} else {
		const GDScriptParser::ClassNode *cl = parser.get_tree();
		HashMap<int, String> funcs;
		get_function_names_recursively(cl, "", funcs);
		for (const KeyValue<int, String> &E : funcs) {
			r_functions->push_back(E.value + ":" + itos(E.key));
		}
	}
#ifdef DEBUG_ENABLED
	if (r_safe_lines) {
		const HashSet<int> &unsafe_lines = parser.get_unsafe_lines();
		for (int i = 1; i <= parser.get_last_line_number(); i++) {
			if (!unsafe_lines.has(i)) {
				r_safe_lines->insert(i);
			}
		}
	}
#endif
	return true;
}
bool GDScriptLanguage::has_named_classes() const {
	return false;
}
bool GDScriptLanguage::supports_builtin_mode() const {