### 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
p_node->end_line = previous.end_line;
	p_node->end_column = previous.end_column;
	p_node->leftmost_column = MIN(p_node->leftmost_column, previous.leftmost_column);
	p_node->rightmost_column = MAX(p_node->rightmost_column, previous.rightmost_column);
}
void GDScriptParser::reset_extents(Node *p_node, GDScriptTokenizer::Token p_token) {
	p_node->start_line = p_token.start_line;
	p_node->end_line = p_token.end_line;
	p_node->start_column = p_token.start_column;
	p_node->end_column = p_token.end_column;
	p_node->leftmost_column = p_token.leftmost_column;
	p_node->rightmost_column = p_token.rightmost_column;
}
void GDScriptParser::reset_extents(Node *p_node, Node *p_from) {
	if (p_from == nullptr) {
		return;
	}
	p_node->start_line = p_from->start_line;
	p_node->end_line = p_from->end_line;
	p_node->start_column = p_from->start_column;
	p_node->end_column = p_from->end_column;
	p_node->leftmost_column = p_from->leftmost_column;
	p_node->rightmost_column = p_from->rightmost_column;
}
#ifdef DEBUG_ENABLED
void GDScriptParser::TreePrinter::increase_indent() {