I’ve currently “solved” this by backfilling with empty divs:
$array_chunks = array_chunk($array_of_posts, 3);
foreach($array_chunks as $posts) {
echo '<div class="wp-block-columns">';
foreach($posts as $post) {
echo '<div class="wp-block-column">';
// entry
echo '</div>';
for ($i = 0; $i < ( 3 - count($posts)); $i++) {
echo '<div class="wp-block-column">';
echo '</div>';
}
}
echo '</div>';
}
But that seems a little clunky. I’d love a more elegant solution.