### 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
result += '\n';
					}
					r_state = DOC_LINE_IN_CODEBLOCK;
					buffer_start = from;
				}
			} break;
			case DOC_LINE_IN_CODE: {
				int pos = line.find("[/code]", from);
				if (pos < 0) {
					process = false;
					break;
				}
				from = pos + 7;
				r_state = DOC_LINE_NORMAL;
			} break;
			case DOC_LINE_IN_CODEBLOCK: {
				int pos = line.find("[/codeblock]", from);
				if (pos < 0) {
					process = false;
					break;
				}
				from = pos + 12;
				if (pos == 0) {
					line_join = "\n";
				} else {
					result += line.substr(buffer_start, pos - buffer_start) + '\n';
				}
				result += "[/codeblock]";
				if (from < len) {
					result += '\n';