### 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.
return true;
}
bool GDScriptLanguage::supports_documentation() const {
	return true;
}
int GDScriptLanguage::find_function(const String &p_function, const String &p_code) const {
	GDScriptTokenizer tokenizer;
	tokenizer.set_source_code(p_code);
	int indent = 0;
	GDScriptTokenizer::Token current = tokenizer.scan();
	while (current.type != GDScriptTokenizer::Token::TK_EOF && current.type != GDScriptTokenizer::Token::ERROR) {
		if (current.type == GDScriptTokenizer::Token::INDENT) {
			indent++;
		} else if (current.type == GDScriptTokenizer::Token::DEDENT) {
			indent--;
		}
		if (indent == 0 && current.type == GDScriptTokenizer::Token::FUNC) {
			current = tokenizer.scan();
			if (current.is_identifier()) {
				String identifier = current.get_identifier();
				if (identifier == p_function) {
					return current.start_line;
				}
			}
		}
		current = tokenizer.scan();
	}
	return -1;
}
Script *GDScriptLanguage::create_script() const {