Images in the blog pages are not indexing except the header image. What is the issue?

Hello, SEO community, I’m working on a client project, and I’ve encountered an issue with the blog pages on their website. The images are not indexing properly, only the header or featured image is being indexed. For example, if a blog page has three images, only the top image (considered the featured image) is indexed, while the images below are not. The website is custom-coded and built on a .NET architecture. I suspect this issue might be due to lazy loading on the lower images. Here’s the difference I’ve noticed in the HTML code: * **Featured image code:** <img id="imgBlog" src="https:// example .com/assets/images/blogs/image-name-1 .webp" alt="I am the description of this image"> * **Below images code:** <img id="\_\_mce\_tmp" src="https:// example .com/assets/images/blogs/image-name-2 .webp" mce\_src="https:// example .com/assets/images/blogs/image-name-2 .webp" alt="I am the description of this image"> What are your thoughts on this? How can I resolve the issue while maintaining the lazy load functionality?