Hello!
I see the issue, but I’m not sure what the cause is. WhatsApp doesn’t provide us a debugger.
Could you try selecting your preferred image via the “Select Image” button for the homepage (preferably via the SEO Settings page) — instead of inputting the image URL manually? Doing it this way will allow TSF to process the image and select the best version for sharing, among outputting additional image details, such as the width and height.
Also, at the Social Meta Settings on the SEO Settings page, see if unchecking “Output multiple Open Graph image tags?” helps. We’re considering defaulting it to unchecked for new sites in the future because it’s causing erratic behavior on some platforms.
If these changes don’t resolve the issue immediately, you may want to check again in a day, or at least try to force-quit and relaunch WhatsApp on your device. Caching is a big culprit with testing.