Embedding inline images in emails broken when upgrading from Laravel 9 to 11

[phjl]

I noticed after updating from Laravel 9 to 11 that embedded email images stopped showing and the code below started returning the attachment filenames like JipwOYRW4e instead of the Content-ID like f150f0a9b59076bc9768a5910cce5d7b@symfony

$message->embed(resource_path('assets/images/email/myimg.png'))

If I override Illuminate/Mail/Message::embed() to return the Content ID instead like below the images end up being displayed like before again:

$cid = Str::random(10);
$dataPart = (new DataPart(new File($file), $cid))->asInline();
$this->message->addPart(
    $dataPart
);

return "cid:" . $dataPart->getContentId();

Obviously I'd rather not override framework classes though so what's a better way of fixing this?