### 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.
break;
			}
			region = E->value();
			in_region = true;
			for (int i = E->key() - 2; i >= 0; i--) {
				if (!is_whitespace(line[i])) {
					return -1;
				}
			}
		}
		if (delimiters[region].line_only) {
			return region;
		}
		int end_col = E->key();
		if (E->value() != -1) {
			if (!E->next()) {
				return region;
			}
			end_col = E->next()->key();
		}
		for (int i = end_col; i < line.length(); i++) {
			if (!is_whitespace(line[i])) {
				return -1;
			}
		}
		return region;
	}
	return in_region ? region : -1;
}
void CodeEdit::_add_delimiter(const String &p_start_key, const String &p_end_key, bool p_line_only, DelimiterType p_type) {