Hi Julie,
I have been experiencing the same issue.
I have been sharing the links to my website since I have created it until now. I did not make any changes to the image / logo since I started my website. I have been sharing the link no issues until about a week ago when the images just did not show up when I shared the link. I have tried to find out a solution and reduced the size of the image and I have tried completely changing the image, both still does not work. I mainly share the link on whatsapp but I also use facebook, instagram and other social platforms
https://specbodyart.com/pages/before-coming-for-a-tattoo-piercing
The theme I have been using is ‘Minimal’