Got it. The posts with emoji’s that were created during the period when emojis had issue had to undergo a simple process called ‘rebuilding’ that will fix the emojis. Either I do the process manually as I come across, or i run a bulk command at some point when i take the site down for a couple of hours.
I am not sure what happened to the picture you referenced- its currently linked to a ‘transparent’ picture. That incident was about the site not serving pictures, already stored on the server, properly because some CORS setting was off. Though in this case, not sure why the site linked to the ‘transaparent’ one. You may have to reupload this one. Have you seen other posts with ‘missing’ pictures? Thanks.