### Godot version

v4.0.beta13.official [caacade56]

### System information

Windows 8.1

### Issue description

The `Unreachable code (statement after return) in function 'function_name()'` warning is given for functions that do not have unreachable code. The same code does not give this warning in v3.5.stable.official [991bb6ac7].

### Steps to reproduce

```
func warning(i: int) -> void:
  if i == 0:
    pass
  elif i == 1:
    return
  else:
    return
  print("yeah")
```

Removing either the `elif` or the `else` removes the warning.

### Minimal reproduction project

N/A; code in reproduction steps can be placed in any blank gdscript file to trigger the error.
push_warning(nd, GDScriptWarning::EMPTY_FILE);
	}
#endif
	push_multiline(false); 
	parse_program();
	pop_multiline();
#ifdef DEBUG_ENABLED
	if (multiline_stack.size() > 0) {
		ERR_PRINT("Parser bug: Imbalanced multiline stack.");
	}
#endif
	if (errors.is_empty()) {
		return OK;
	} else {
		return ERR_PARSE_ERROR;
	}
}
GDScriptTokenizer::Token GDScriptParser::advance() {
	lambda_ended = false; 
	if (current.type == GDScriptTokenizer::Token::TK_EOF) {
		ERR_FAIL_COND_V_MSG(current.type == GDScriptTokenizer::Token::TK_EOF, current, "GDScript parser bug: Trying to advance past the end of stream.");
	}
	if (for_completion && !completion_call_stack.is_empty()) {
		if (completion_call.call == nullptr && tokenizer.is_past_cursor()) {
			completion_call = completion_call_stack.back()->get();
			passed_cursor = true;
		}
	}
	previous = current;
	current = tokenizer.scan();