### 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
}
		space_prefix = String(" ").repeat(i - 2);
	}
	while (comments.has(line)) {
		if (!comments[line].new_line || !comments[line].comment.begins_with("##")) {
			break;
		}
		String doc_line = comments[line++].comment.trim_prefix("##");
		String title, link; 
		if (state == DOC_LINE_NORMAL) {
			
			String stripped_line = doc_line.strip_edges();
			if (stripped_line.is_empty()) {
				if (mode == BRIEF && !p_brief.is_empty()) {
					mode = DESC;
				}
				continue;
			} else if (stripped_line.begins_with("@tutorial")) {
				int begin_scan = String("@tutorial").length();
				if (begin_scan >= stripped_line.length()) {
					continue; 
				}
				if (stripped_line[begin_scan] == ':') { 
					
					title = "";
					link = stripped_line.trim_prefix("@tutorial:").strip_edges();
				} else {
					/* Syntax:
					 *   @tutorial ( The Title Here )         :         https://the.url/
					 *             ^ open           ^ close   ^ colon   ^ url