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Ad templates don't work with Articles
Ad templates (which community ads use) don't give an image for Article type posts.
For example, for this promoted post, the image url that is used in the sidebar is https://languages.codidact.com/ca/posts/277380.png which gives a 500 server error and so appears as a dead image icon.
This also applies to category ad templates for categories using Article types, e.g. these also fail and would give a dead image icon if embedded: