\XF\Entity\Thread::getCoverUrl() may cause undefined array key

[Kirby]

XF\Entity\CoverImageTrait::getCoverImageInternal()

PHP:

/** @var Attachment $attachment */ if ($embeddedAttachments[$attachment->attachment_id]) {
    continue; }

This calls \XF\Mvc\AbstractCollection::offsetGet()
PHP:

public function offsetGet($key): ?Entity {
    return $this->entities[$key]; }

As can be seen, this directly accesses the internal array without checking if the key exists, so if it does not exist this generates a warning Undefined array key ......

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