Hello,
Thank you for contacting Rank Math and bringing your concern to our attention.
In Rank Math sitemaps, we are following the required Image tag definitions for sitemap images.
Here’s a link for more information:
https://developers.google.com/search/docs/advanced/sitemaps/image-sitemaps#image-tag-definitions
Could you please confirm if this is not the case on your site? If so, please share the affected sitemap URL so we can check as well.
Looking forward to helping you.
Thank you.
Plugin get ALTT TEXT and put it into image:caption.
This is wrong.
I try explain this by graphic.
https://i.imgur.com/Wj2Hu56.png

Hello,
The alt text is added inside the image:caption tag by default in the sitemap. However, Google will read the data from the actual page/post and will be able to detect the correct alt, title, and other attributes of the images from the HTML of your page.
Having said that, I have forwarded this to the devs and they will look into this.
We will inform you when we have an update. Don’t hesitate to get in touch in case you need any other assistance.
Thanks.
Hello,
We are super happy that we could address your concern.
Please do not hesitate to let us know if you need our assistance with anything else.
Thank you.