### 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 = VARIABLE;
		}
	};
	struct WhileNode : public Node {
		ExpressionNode *condition = nullptr;
		SuiteNode *loop = nullptr;
		WhileNode() {
			type = WHILE;
		}
	};
	enum CompletionType {
		COMPLETION_NONE,
		COMPLETION_ANNOTATION, 
		COMPLETION_ANNOTATION_ARGUMENTS, 
		COMPLETION_ASSIGN, 
		COMPLETION_ATTRIBUTE, 
		COMPLETION_ATTRIBUTE_METHOD, 
		COMPLETION_BUILT_IN_TYPE_CONSTANT_OR_STATIC_METHOD, 
		COMPLETION_CALL_ARGUMENTS, 
		
		COMPLETION_GET_NODE, 
		COMPLETION_IDENTIFIER, 
		COMPLETION_INHERIT_TYPE, 
		COMPLETION_METHOD,