Amp Carousel doesn’t have alt tags

Yes all the images have alt text. I’m using a wordpress gallery shortcode to embed and then selecting display as carousel in the sidebar. Here is the html with a standard gallery you can see the alt tag.

<div class="gallery-icon landscape">
				<a href="https://www.ryansmithphotography.com/wp-content/uploads/2017/09/couple-walking-with-horse-drawn-carriage-in-background-wachesaw-plantation.jpg"><amp-img width="1500" height="1058" src="https://www.ryansmithphotography.com/wp-content/uploads/2017/09/couple-walking-with-horse-drawn-carriage-in-background-wachesaw-plantation-1500x1058.jpg" class="attachment-large size-large amp-wp-enforced-sizes i-amphtml-element i-amphtml-layout-intrinsic i-amphtml-layout-size-defined i-amphtml-layout" alt="Couple walking with horse drawn carriage in background Wachesaw Plantation" aria-describedby="gallery-2-30428" srcset="https://www.ryansmithphotography.com/wp-content/uploads/2017/09/couple-walking-with-horse-drawn-carriage-in-background-wachesaw-plantation-1500x1058.jpg 1500w, https://www.ryansmithphotography.com/wp-content/uploads/2017/09/couple-walking-with-horse-drawn-carriage-in-background-wachesaw-plantation-300x212.jpg 300w, https://www.ryansmithphotography.com/wp-content/uploads/2017/09/couple-walking-with-horse-drawn-carriage-in-background-wachesaw-plantation-600x423.jpg 600w, https://www.ryansmithphotography.com/wp-content/uploads/2017/09/couple-walking-with-horse-drawn-carriage-in-background-wachesaw-plantation-1100x776.jpg 1100w, https://www.ryansmithphotography.com/wp-content/uploads/2017/09/couple-walking-with-horse-drawn-carriage-in-background-wachesaw-plantation-450x317.jpg 450w" layout="intrinsic" i-amphtml-layout="intrinsic"><i-amphtml-sizer class="i-amphtml-sizer">
        <img alt="" role="presentation" aria-hidden="true" class="i-amphtml-intrinsic-sizer" src="data:image/svg+xml;charset=utf-8,<svg height=&quot;1058px&quot; width=&quot;1500px&quot; xmlns=&quot;http://www.w3.org/2000/svg&quot; version=&quot;1.1&quot;/>">
      </i-amphtml-sizer><noscript><img width="1500" height="1058" src="https://www.ryansmithphotography.com/wp-content/uploads/2017/09/couple-walking-with-horse-drawn-carriage-in-background-wachesaw-plantation-1500x1058.jpg" class="attachment-large size-large" alt="Couple walking with horse drawn carriage in background Wachesaw Plantation" aria-describedby="gallery-2-30428" sizes="(max-width: 1500px) 100vw, 1500px"></noscript><img decoding="async" alt="Couple walking with horse drawn carriage in background Wachesaw Plantation" aria-describedby="gallery-2-30428" srcset="https://www.ryansmithphotography.com/wp-content/uploads/2017/09/couple-walking-with-horse-drawn-carriage-in-background-wachesaw-plantation-1500x1058.jpg 1500w, https://www.ryansmithphotography.com/wp-content/uploads/2017/09/couple-walking-with-horse-drawn-carriage-in-background-wachesaw-plantation-300x212.jpg 300w, https://www.ryansmithphotography.com/wp-content/uploads/2017/09/couple-walking-with-horse-drawn-carriage-in-background-wachesaw-plantation-600x423.jpg 600w, https://www.ryansmithphotography.com/wp-content/uploads/2017/09/couple-walking-with-horse-drawn-carriage-in-background-wachesaw-plantation-1100x776.jpg 1100w, https://www.ryansmithphotography.com/wp-content/uploads/2017/09/couple-walking-with-horse-drawn-carriage-in-background-wachesaw-plantation-450x317.jpg 450w" src="https://www.ryansmithphotography.com/wp-content/uploads/2017/09/couple-walking-with-horse-drawn-carriage-in-background-wachesaw-plantation-1500x1058.jpg" class="i-amphtml-fill-content i-amphtml-replaced-content" sizes="(max-width: 1707px) 490px, 100vw"></amp-img></a>
			</div>

And here is the same gallery but with display as carousel selected.
<div class="i-amphtml-slide-item i-amphtml-slide-item-show"><a href="https://www.ryansmithphotography.com/wp-content/uploads/2017/09/couple-walking-with-horse-drawn-carriage-in-background-wachesaw-plantation-1500x1058.jpg" class="amp-carousel-slide" aria-hidden="false"><amp-img src="https://www.ryansmithphotography.com/wp-content/uploads/2017/09/couple-walking-with-horse-drawn-carriage-in-background-wachesaw-plantation-1500x1058.jpg" width="1500" height="1058" layout="responsive" class="i-amphtml-element i-amphtml-layout-responsive i-amphtml-layout-size-defined i-amphtml-layout" i-amphtml-layout="responsive"><i-amphtml-sizer style="padding-top: 70.5333%;"></i-amphtml-sizer><img decoding="async" src="https://www.ryansmithphotography.com/wp-content/uploads/2017/09/couple-walking-with-horse-drawn-carriage-in-background-wachesaw-plantation-1500x1058.jpg" class="i-amphtml-fill-content i-amphtml-replaced-content"></amp-img></a></div>

Thanks for the help. Just to explain a bit better on the second issue and I can add it to GitHub. I have a gallery shortcode like [gallery ..... link="file"] so each image should be linked to its source image. And without any amp options selected it works correctly. However, on that example page, I have the amp option to add lightbox selected in the editor. If the lightbox selection is on, then the the links to the source images disappears and the lightbox doesn’t work. It’s the same as if link=”file” is not in the shortcode. Hopefully that makes sense.