First Product Image on Woocommerce Single Product Page Not Converting to Next-Gen with <picture> Tag

[saranshj4]

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Describe the bug
The first product image on the Woocommerce single product page does not convert to next-gen formats (WebP/AVIF) using the <picture> tag method. While other images, including those in the product gallery, are converted successfully, the first product image remains in its original format. The <img> tag is replaced with the <picture> tag, but it does not pull the next-gen version.

To Reproduce
Steps to reproduce the behavior:

1. Update to the latest versions of Woocommerce and Imagify.
2. Enable next-gen image display in Imagify settings and select the <picture> tag method.
3. Ensure next-gen versions are generated for all images.
4. Navigate to a Woocommerce single product page.
5. Observe that the first product image is not converted to next-gen format, while other images are.

Expected behavior
The first product image should convert to next-gen formats using the <picture> tag method, similar to the other images on the page.

The workaround is to use the rewrite rules method to display next-gen seamlessly.

Screenshots

Additional context
In my testing, I noticed that the gallery thumbnails (100x100) were not loading in next-gen formats. However, this was not the case in other user websites.

Acceptance Criteria (for WP Media team use only)
Clear instructions for developers, to be added before the grooming

[saranshj4]

https://secure.helpscout.net/conversation/2623328754/496843?folderId=8160051
https://secure.helpscout.net/conversation/2636795531/499493?folderId=676697

[saranshj4]

This might be related - #661 (comment)