ACF Gallery not linking to image sizes after WordPress update from 4.x to 5.21

I’m absolutely perplexed. The custom field and php in the template have been running for years without incident. As you can see below I have two image sizes to call, the ‘thumbnail’ and the custom size ‘works’. Now however it just calls the original image in most cases . . . . the thumbnails should be 300×300 if you check in the link the first 8 images are not 300×300 in fact they are the full sized image and to add to the strange the next 16 images are correct!
– I’ve checked to see that the all the correct images are on the server and they are.
– The only error I get in the console is: Unchecked runtime.lastError: The message port closed before a response was received.
– I did get this error on the page right after the update, but when I increased the memory for WordPress it went away: Fatal error: Maximum execution time of 30 seconds exceeded in /home/content/73/10555273/html/wp-includes/class-wp-image-editor-imagick.php on line 155

<?php
  
$images = get_field('galleria_principale');
 
if( $images ): ?>
    <div id="artists-images" class="linksy">
        <ul class="small-block-grid-1 medium-block-grid-3 large-block-grid-4">
            <?php foreach( $images as $image ): ?>
                <li>
                    <a  class="fancybox"  rel="gallery01" href="<?php echo $image['sizes']['works']; ?>"  data-title-id="<?php echo $image['alt']; ?>"  title="<?php echo $image['title']; ?>">  <img src="<?php echo $image['sizes']['thumbnail']; ?>" alt="" /></a>
                    <div id="<?php echo $image['alt']; ?>" class="hidden">
						<h4><?php echo $image['title']; ?></h4>
						<p><?php echo $image['description']; ?></p>
					</div>
                </li>
				
            <?php endforeach; ?>
        </ul>
    </div>

  
<?php endif; ?>

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