Bug: Moderation-blocked images attached to posts are silently removed (should be noisily removed)

[mcclure]

Is there an existing issue for this?

• I have searched the issues (both open and closed)

Current Behavior

There is an instance misskey.design. Many US/EU instances block image attachments on misskey.design due to the server hosting some adult content which is legal in misskey's jurisdiction but possibly not in other countries. This policy is longstanding and the policy is not itself the problem.

There's a post here:
https://misskey.design/notes/9wj97s1whc
Posted by user:
https://misskey.design/@demidoro
It is not adult content. It is the words "夏だね" and an animation of a girl looking out a window.

When viewed on the official iPhone client for Mastodon, this post shows only the words 夏だね. Not only is the image missing, there is no indication that content is missing:

Content being excluded for moderation reasons is fine, but hiding that the content was moderated out could cause confusion or misunderstandings.

Expected Behavior

The expected behavior is that the post should have some visual indicator showing that an image is missing. Tapping on the missing-content indicator should cause the missing content to be loaded from its original server.

For example, this is what appears on Mastodon.social web ("expected behavior"):

Tapping the "preview not shown" links you directly to the host server.

Meanwhile this is what appears in Tusky for Android (also "expected behavior"):

(This is not as good as Mastodon web because tapping the button sends you to a dead link, but it at least it shows you something is missing.)

Steps To Reproduce

Open the profile @demidoro@misskey.design, or otherwise observe a feed where the 夏だね post is visible. You will see as in the above screenshot.

Environment

Tested with app 2.6.1 from Google Play on a Sony Xperia 5 III running Android 13. Server was mastodon.social.

Anything else?

Official Mastodon for iOS also has this problem mastodon/mastodon-ios#1338