Good day.

I've the same problem.
I've trying all the solutions of the above commets but without result.
The image is less of 300kb and the resolution is 1024x768 pixel.
The length of title and description are within the limits given above and the image is with the full url in https.

I includes the screenshot of my phone.
As you can see the preview in the sharing phase is displayed correctly, but then on WhatsApp the space appears at the top for a moment and then it turns white.
I tried with another site on a different server (which I did not) and on WhatsApp you can see the preview with title, description and photos.
Could it depend on the chmode of the photo which is 666?