Block missing siblings (and prev, next) when added programmatically

The CMS Questions
1

I’m trying to prepend a custom block to an existing collection of blocks. This is the code I’m using:

$chapterTitle = new Block([
‘type’ => ‘heading’,
‘content’ => [‘level’=>‘h2’, ‘text’=>$chap->title()]
]);
$blocks = $chap->content_blocks()->toBlocks();
$blocks->prepend( $chapterTitle );

The chapter title block exists when looping over $blocks but it does not have any siblings, so the block->next() returns null.
The first of block of the original collection also returns null on block->prev()

I’ve tried to ->add() instead of prepend but the same problem comes up.
Am I missing something?

2

You can pass the collection as parameter:

dump($block->next($blocks));
3

Excuse me for this late response but thank you!