### 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.
r_type.assigned_expression = dn->elements[i].value;
								found = _guess_expression_type(c, dn->elements[i].value, r_type);
								break;
							}
						}
					}
					if (!found) {
						found = _guess_identifier_type_from_base(c, base, subscript->attribute->name, r_type);
					}
				} else {
					if (subscript->index == nullptr) {
						found = false;
						break;
					}
					GDScriptParser::CompletionContext c = p_context;
					c.current_line = subscript->start_line;
					GDScriptCompletionIdentifier base;
					if (!_guess_expression_type(c, subscript->base, base)) {
						found = false;
						break;
					}
					GDScriptCompletionIdentifier index;
					if (!_guess_expression_type(c, subscript->index, index)) {
						found = false;
						break;
					}
					if (base.value.in(index.value)) {
						Variant value = base.value.get(index.value);
						r_type = _type_from_variant(value);
						found = true;