desktop-vs-image-lcp-2.post_content.html

<!-- wp:columns -->
<div class="wp-block-columns"><!-- wp:column {"width":"25%"} -->
    <div class="wp-block-column" style="flex-basis:25%"><!-- wp:image {"id":112,"sizeSlug":"full","linkDestination":"none"} -->
        <figure class="wp-block-image size-full"><img src="http://example.org/wp-content/uploads/2023/09/image.jpeg" alt="" class="wp-image-112"/><figcaption class="wp-element-caption">"<a href="https://www.flickr.com/photos/136485307@N06/21912132615" target="_blank" rel="noreferrer noopener">AS17-152-23275</a>" by <a href="https://www.flickr.com/photos/136485307@N06" target="_blank" rel="noreferrer noopener">Apollo Image Gallery</a>/ <a href="https://creativecommons.org/publicdomain/mark/1.0/?ref=openverse" target="_blank" rel="noreferrer noopener">pdm 1.0</a></figcaption></figure>
        <!-- /wp:image --></div>
    <!-- /wp:column -->

    <!-- wp:column {"width":"50%"} -->
    <div class="wp-block-column" style="flex-basis:50%"><!-- wp:image {"id":115,"sizeSlug":"large","linkDestination":"none"} -->
        <figure class="wp-block-image size-large"><img src="http://example.org/wp-content/uploads/2023/09/image-3-1024x1024.jpeg" alt="" class="wp-image-115"/><figcaption class="wp-element-caption">"<a href="https://www.rawpixel.com/image/8718239/photo-image-moon-space-planet" target="_blank" rel="noreferrer noopener">Taken by Apollo 8 crewmember</a>"/ <a href="https://creativecommons.org/publicdomain/zero/1.0/?ref=openverse" target="_blank" rel="noreferrer noopener">CC0 1.0</a></figcaption></figure>
        <!-- /wp:image --></div>
    <!-- /wp:column -->

    <!-- wp:column {"width":"25%"} -->
    <div class="wp-block-column" style="flex-basis:25%"><!-- wp:image {"id":113,"sizeSlug":"full","linkDestination":"none"} -->
        <figure class="wp-block-image size-full"><img src="http://example.org/wp-content/uploads/2023/09/image-1.jpeg" alt="" class="wp-image-113"/><figcaption class="wp-element-caption">"<a href="https://www.flickr.com/photos/136485307@N06/21517152309" target="_blank" rel="noreferrer noopener">AS17-136-20710</a>" by <a href="https://www.flickr.com/photos/136485307@N06" target="_blank" rel="noreferrer noopener">Apollo Image Gallery</a>/ <a href="https://creativecommons.org/publicdomain/mark/1.0/?ref=openverse" target="_blank" rel="noreferrer noopener">pdm 1.0</a></figcaption></figure>
        <!-- /wp:image --></div>
    <!-- /wp:column --></div>
<!-- /wp:columns -->

The Columns block automatically stacks columns vertically on mobile. The columns can have different widths:

If the initial column is not the widest, this can result in there being a different LCP elements on desktop vs mobile (LCP element in red outline):

Mobile LCP Element	Desktop LCP Element