\Drupal\Core\Render\BubbleableMetadata::applyTo overwrites the attachments property on a render array, rather than merging with any existing attachments
Create a render array, and set #attachments property on it.
Create a BubbleableMetadata object, and call ::applyTo with the render array
See your existing attachments clobbered
Merge instead of wipe like we do for #cache
Closed: works as designed
11.0 🔥
render system
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
This is the same as CacheableMetadata::applyTo where you should merge metadata before using applyTo.
Something like:
$x = new BubbleableMetadata();
// Add stuff to $x
$y = BubbleableMetadata::createFromRenderArray($build);
$x = $x->merge($y); // or use $x->addCacheableDependency($y);
$x->applyTo($build);