Demonstration of blocks in post content that cause fetchpriority to be applied to the wrong image

wordpress-fetchpriority-not-on-lcp-image.post_content.html

<!-- wp:paragraph -->
<p><em>Note how the first image is getting <code>fetchpriority=high</code> even though the second image is larger and is the LCP element.</em></p>
<!-- /wp:paragraph -->

<!-- wp:media-text {"mediaId":23,"mediaType":"image","mediaWidth":34,"isStackedOnMobile":false,"imageFill":true,"focalPoint":{"x":0.73,"y":0.42}} -->
<div class="wp-block-media-text is-image-fill" style="grid-template-columns:34% auto"><figure class="wp-block-media-text__media" style="background-image:url(http://localhost:10008/wp-content/uploads/2023/05/American_bison_k5680-1-300x196.webp);background-position:73% 42%"><img src="http://localhost:10008/wp-content/uploads/2023/05/American_bison_k5680-1-300x196.webp" alt="" class="wp-image-23 size-full"/></figure><div class="wp-block-media-text__content"><!-- wp:paragraph {"placeholder":"Content…"} -->
<p>A <strong>bison</strong> (pl: <strong>bison</strong>) is a large <a href="https://en.wikipedia.org/wiki/Bovine">bovine</a> in the <a href="https://en.wikipedia.org/wiki/Genus">genus</a> <em><strong>Bison</strong></em> (Greek: "wild ox" (bison)) within the tribe <a href="https://en.wikipedia.org/wiki/Bovini">Bovini</a>. Two <a href="https://en.wikipedia.org/wiki/Extant_taxon">extant</a> and numerous <a href="https://en.wikipedia.org/wiki/Extinction">extinct</a> species are recognised.</p>
<!-- /wp:paragraph --></div></div>
<!-- /wp:media-text -->

<!-- wp:image {"id":33,"sizeSlug":"large"} -->
<figure class="wp-block-image size-large"><img src="http://localhost:10008/wp-content/uploads/2023/09/image-1024x683.jpeg" alt="" class="wp-image-33"/><figcaption class="wp-element-caption">"<a href="https://www.rawpixel.com/image/8732279/photo-image-face-public-domain-animal" target="_blank" rel="noreferrer noopener">Portrait of a bull bison</a>" by National Park Service/ <a href="https://creativecommons.org/publicdomain/zero/1.0/?ref=openverse" target="_blank" rel="noreferrer noopener">CC0 1.0</a></figcaption></figure>
<!-- /wp:image -->

wordpress-fetchpriority-not-on-lcp-image.rendered_blocks.html

<p><em>Note how the first image is getting <code>fetchpriority=high</code> even though the second image is larger and is
    the LCP element.</em></p>

<div class="wp-block-media-text is-image-fill" style="grid-template-columns:34% auto">
    <figure class="wp-block-media-text__media"
            style="background-image:url(http://localhost:10008/wp-content/uploads/2023/05/American_bison_k5680-1-300x196.webp);background-position:73% 42%">
        <img decoding="async" fetchpriority="high" width="300" height="196"
             src="http://localhost:10008/wp-content/uploads/2023/05/American_bison_k5680-1-300x196.webp" alt=""
             class="wp-image-23 size-full"></figure>
    <div class="wp-block-media-text__content">
        <p>A <strong>bison</strong> (pl: <strong>bison</strong>) is a large <a
                href="https://en.wikipedia.org/wiki/Bovine">bovine</a> in the <a
                href="https://en.wikipedia.org/wiki/Genus">genus</a> <em><strong>Bison</strong></em> (Greek: “wild ox”
            (bison)) within the tribe <a href="https://en.wikipedia.org/wiki/Bovini">Bovini</a>. Two <a
                    href="https://en.wikipedia.org/wiki/Extant_taxon">extant</a> and numerous <a
                    href="https://en.wikipedia.org/wiki/Extinction">extinct</a> species are recognised.</p>
    </div>
</div>

<figure class="wp-block-image"><img decoding="async" width="1300" height="867"
                                    src="http://localhost:10008/wp-content/uploads/2023/09/image.jpeg" alt=""
                                    class="wp-image-33">
    <figcaption class="wp-element-caption">“<a
            href="https://www.rawpixel.com/image/8732279/photo-image-face-public-domain-animal" target="_blank"
            rel="noreferrer noopener">Portrait of a bull bison</a>” by National Park Service/ <a
            href="https://creativecommons.org/publicdomain/zero/1.0/?ref=openverse" target="_blank"
            rel="noreferrer noopener">CC0 1.0</a></figcaption>
</figure>

First image was uploaded to the media library. The medium resolution was selected, which is 300x300 by default in WordPress.

Second image was inserted via Openverse.