### Godot version

Godot 4.0 RC 2

### System information

Windows 11

### Issue description

As the title states you get no autocompletion when statically typing.
Of course the code still works, but it shouldn't be neccessary to cast an object to a type it already is.

### Steps to reproduce

1. Create child class with some functionality
![image](https://user-images.githubusercontent.com/100119945/220173809-0b2b2788-d986-4fa7-815c-444268d09c32.png)

2. Get node in parent class and call childs function
![image](https://user-images.githubusercontent.com/100119945/220174167-5ff3c8e9-863e-4fbd-a3cf-d88d34597b39.png)



### Minimal reproduction project

N/A
const GDScriptParser::IfNode *_if = static_cast<const GDScriptParser::IfNode *>(p_context.current_suite->statements[i]);
				c.current_suite = _if->true_block;
				_find_last_return_in_block(c, r_last_return_line, r_last_returned_value);
				if (_if->false_block) {
					c.current_suite = _if->false_block;
					_find_last_return_in_block(c, r_last_return_line, r_last_returned_value);
				}
			} break;
			case GDScriptParser::Node::MATCH: {
				const GDScriptParser::MatchNode *match = static_cast<const GDScriptParser::MatchNode *>(p_context.current_suite->statements[i]);
				for (int j = 0; j < match->branches.size(); j++) {
					c.current_suite = match->branches[j]->block;
					_find_last_return_in_block(c, r_last_return_line, r_last_returned_value);
				}
			} break;
			case GDScriptParser::Node::RETURN: {
				const GDScriptParser::ReturnNode *ret = static_cast<const GDScriptParser::ReturnNode *>(p_context.current_suite->statements[i]);
				if (ret->return_value) {
					if (ret->start_line > r_last_return_line) {
						r_last_return_line = ret->start_line;
						*r_last_returned_value = ret->return_value;
					}
				}
			} break;
			default:
				break;
		}
	}
}
static bool _guess_method_return_type_from_base(GDScriptParser::CompletionContext &p_context, const GDScriptCompletionIdentifier &p_base, const StringName &p_method, GDScriptCompletionIdentifier &r_type) {