JS WebP Rewriting not working

JS WebP Rewriting not working after I click the “load more” button for my video posts.

On the first post, you can see that the video have 3 attributes:
-data-poster-webp
-data-poster-image
-poster

The posts that loaded after “load more” only have 2 attributes:
-data-poster-webp
-data-poster-image

The “poster” attribute is missing hence my video posts don’t have an image.

Here is my staging site https://virtualwiz.com.my/teasdz/.

• This topic was modified 4 years, 5 months ago by Mark.
• This topic was modified 4 years, 5 months ago by Mark.
• This topic was modified 4 years, 5 months ago by Mark.

The page I need help with: [log in to see the link]