Facebook no longer loads previews when provided public album links

[FlasherZ]

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Nextcloud version (eg, 29.0.5): 29.0.5
Operating system and version (eg, Ubuntu 24.04): Ubuntu 22.04.4 LTS
Apache or nginx version (eg, Apache 2.4.25): 2.4.52-1ubuntu4.12
PHP version (eg, 8.3): 8.1.2-1ubuntu2.18

The issue you are facing:

Sometime between February 21 and March 19, Facebook will no longer generate / load preview images from albums on Nextcloud when public share links are provided. Previously, when I entered an album link, Facebook would load an image as the preview with the album name, but since March it only shows a link with no preview at all. It also just shows only the site name.

Did Facebook do something to block this as a preview, or did something change in Nextcloud in that timeframe that broke previews?

Here’s an example of what it looked like in February (blurred identifying info):

and here’s what it looks like when I do it now:

Note that in the first link, the album name ending in “02-21-2024” is displayed, while in the second photo, the site name (“photos..org”) is the only thing displayed.

Is this the first time you’ve seen this error? (Y/N): Y

Steps to replicate it:

1. Create a new album in either Photos or Memories
2. Obtain the public album link from the “share” function
3. Paste it into a Facebook post box - you’ll note the preview doesn’t load

There don’t appear to be any log file entries (warnings, errors) applicable here.

[FlasherZ]

Here’s what it looks like from the Apache logs when Facebook loads the album page:

31.13.115.3 - - [25/Aug/2024:19:23:07 +0000] "GET /index.php/apps/memories/a/NKfM7j5pXxRBUdpxaRhuJprj9ySTWQ7l HTTP/2.0" 200 18607 "-" "facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)"

From what I can see, the returned content only gives Facebook Javascript and there are no images that can be referenced. Did that change between 28.x and 29.x? Is there a way to have Nextcloud offer up an album image in a public link?