Warning: Undefined array key 0 in ParagraphsTableFormatter.php on line 474

Okay looks like this isn't just the case for empty paragraphs. It seems like a logical bug, maybe regression.

In these lines:

    $target_bundles = array_keys($handler["target_bundles"]);
    if (!empty($handler['negate'])) {
      $bundles = $this->entityTypeBundleInfo->getBundleInfo('paragraph');
      $target_bundles = array_keys(array_diff_key($bundles, $handler['target_bundles']));
    }
    $type = key($target_bundles);

array_keys() already returns the keys as array values. So we need to get the value to get the type machine name:

$type = reset($target_bundles);

Otherwise, $type is the numeric key ($type=0) and the following lines break.

The MR fixes that, please review.

Seems this was once again merged without credit from the maintainer.