### 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
push_error(vformat(R"(Invalid argument %d of annotation "@export_flags": Expected flag name.)", i + 1), p_annotation->arguments[i]);
				return false;
			}
			if (t.size() == 2) {
				if (t[1].is_empty()) {
					push_error(vformat(R"(Invalid argument %d of annotation "@export_flags": Expected flag value.)", i + 1), p_annotation->arguments[i]);
					return false;
				}
				if (!t[1].is_valid_int()) {
					push_error(vformat(R"(Invalid argument %d of annotation "@export_flags": The flag value must be a valid integer.)", i + 1), p_annotation->arguments[i]);
					return false;
				}
				int64_t value = t[1].to_int();
				if (value < 1 || value >= (1LL << max_flags)) {
					push_error(vformat(R"(Invalid argument %d of annotation "@export_flags": The flag value must be at least 1 and at most 2 ** %d - 1.)", i + 1, max_flags), p_annotation->arguments[i]);
					return false;
				}
			} else if (i >= max_flags) {
				push_error(vformat(R"(Invalid argument %d of annotation "@export_flags": Starting from argument %d, the flag value must be specified explicitly.)", i + 1, max_flags + 1), p_annotation->arguments[i]);
				return false;
			}
		}
		if (i > 0) {
			hint_string += ",";
		}
		hint_string += arg_string;
	}
	variable->export_info.hint_string = hint_string;
	
	DataType export_type = variable->get_datatype();