### 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.
TypedArray<String> prefixes;
	for (const char32_t &E : code_completion_prefixes) {
		prefixes.push_back(String::chr(E));
	}
	return prefixes;
}
String CodeEdit::get_text_for_code_completion() const {
	StringBuilder completion_text;
	const int text_size = get_line_count();
	for (int i = 0; i < text_size; i++) {
		String line = get_line(i);
		if (i == get_caret_line()) {
			completion_text += line.substr(0, get_caret_column());
			
			completion_text += String::chr(0xFFFF);
			completion_text += line.substr(get_caret_column(), line.size());
		} else {
			completion_text += line;
		}
		if (i != text_size - 1) {
			completion_text += "\n";
		}
	}
	return completion_text.as_string();
}
void CodeEdit::request_code_completion(bool p_force) {