Issue with Displaying Images in Next-Gen Format on Website

Hi,

I’m experiencing an issue with displaying images in the Next-Gen format on our site.

The .webp files are being generated correctly. However, in my theme, when I use get_the_post_thumbnail_url(), the .webp image appears as expected.

But when I try to retrieve a custom size with get_the_post_thumbnail_url(null, ‘thumbnail’), it does not appear.

I noticed that the featured images are being created with the filename format image-name.jpg.webp (and these work properly). However, the other sizes are named image-name.webp (without the double extension).

I suspect that this issue might be due to the plugin not correctly replacing the images for different sizes.

This is the only detail remaining for me to be able to finalize my project and purchase the license for my sites.

Thank you.