### 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.
if (p_annotation->name == SNAME("@export_range")) {
		if (export_type.builtin_type == Variant::INT) {
			variable->export_info.type = Variant::INT;
		}
	}
	if (p_annotation->name == SNAME("@export_multiline")) {
		if (export_type.builtin_type == Variant::ARRAY && export_type.has_container_element_type()) {
			DataType inner_type = export_type.get_container_element_type();
			if (inner_type.builtin_type != Variant::STRING) {
				push_error(vformat(R"("%s" annotation on arrays requires a string type but type "%s" was given instead.)", p_annotation->name.operator String(), inner_type.to_string()), variable);
				return false;
			}
			String hint_prefix = itos(inner_type.builtin_type) + "/" + itos(variable->export_info.hint);
			variable->export_info.hint = PROPERTY_HINT_TYPE_STRING;
			variable->export_info.hint_string = hint_prefix + ":" + variable->export_info.hint_string;
			variable->export_info.type = Variant::ARRAY;
			return true;
		} else if (export_type.builtin_type == Variant::DICTIONARY) {
			variable->export_info.type = Variant::DICTIONARY;
			return true;
		}
	}
	if (p_annotation->name == SNAME("@export")) {
		if (variable->datatype_specifier == nullptr && variable->initializer == nullptr) {
			push_error(R"(Cannot use simple "@export" annotation with variable without type or initializer, since type can't be inferred.)", p_annotation);
			return false;
		}
		bool is_array = false;
		if (export_type.builtin_type == Variant::ARRAY && export_type.has_container_element_type()) {
			export_type = export_type.get_container_element_type();