### Godot version

v4.0.3.stable.official [5222a99f5]
Master [6101240231600c871f5c5473872532c68ea3268c] (confirmed by https://github.com/godotengine/godot/issues/77666#issuecomment-1568952502)

### System information

Window 10

### Issue description

References are not unreferenced at the end of `if` scopes.

### Steps to reproduce

Copy, paste and run the snippet below, check the results:

```gdscript
extends Node


func _ready() -> void:
  var ref := RefCounted.new()
  var ref_count : int

  # OK
  ref_count = ref.get_reference_count()
  print('Expected: 1, Result: %d' % ref_count)

  # OK
  if true:
    var temp := ref
    temp = null

  ref_count = ref.get_reference_count()
  print('Expected: 1, Result: %d' % ref_count)

  # FAIL
  if true:
    var temp := ref

  ref_count = ref.get_reference_count()
  print('Expected: 1, Result: %d' % ref_count)
```

Output example:

```
Expected: 1, Result: 1
Expected: 1, Result: 1
Expected: 1, Result: 2
```

### Minimal reproduction project

N/A
type = GROUP;
				annotation = p_annotation;
			}
		};
		IdentifierNode *identifier = nullptr;
		String icon_path;
		Vector<Member> members;
		HashMap<StringName, int> members_indices;
		ClassNode *outer = nullptr;
		bool extends_used = false;
		bool onready_used = false;
		bool has_static_data = false;
		bool annotated_static_unload = false;
		String extends_path;
		Vector<IdentifierNode *> extends; 
		DataType base_type;
		String fqcn; 
#ifdef TOOLS_ENABLED
		String doc_description;
		String doc_brief_description;
		Vector<Pair<String, String>> doc_tutorials;
		
		void set_enum_value_doc(const StringName &p_name, const String &p_doc_description) {
			ERR_FAIL_INDEX(members_indices[p_name], members.size());
			members.write[members_indices[p_name]].enum_value.doc_description = p_doc_description;
		}
#endif 
		bool resolved_interface = false;
		bool resolved_body = false;
		Member get_member(const StringName &p_name) const {