Due to upgrading extiverse to Laravel 8 (and php 8) the images can no longer be generated for extensions that use a (complex) svg. These usually include language packs. My recommendation for now is to use a png or gif at a higher resolution. I'm occassionally working on this issue, but as imagick support/maintenance is pretty slow there's no fast solution. GD as an alternative has no support for reading svg sadly.
On another note I added Open Graph images (and meta data) to extension pages, resulting in these kind of images when shared on channels that support open graph images:
