### 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.
clear();
	String source = p_source_code;
	int cursor_line = -1;
	int cursor_column = -1;
	for_completion = p_for_completion;
	int tab_size = 4;
#ifdef TOOLS_ENABLED
	if (EditorSettings::get_singleton()) {
		tab_size = EditorSettings::get_singleton()->get_setting("text_editor/behavior/indent/size");
	}
#endif 
	if (p_for_completion) {
		
		const Vector<String> lines = p_source_code.split("\n");
		cursor_line = 1;
		cursor_column = 1;
		for (int i = 0; i < lines.size(); i++) {
			bool found = false;
			const String &line = lines[i];
			for (int j = 0; j < line.size(); j++) {
				if (line[j] == char32_t(0xFFFF)) {
					found = true;
					break;
				} else if (line[j] == '\t') {
					cursor_column += tab_size - 1;
				}
				cursor_column++;
			}