This is supposed to work and I've seen it work. But so many people complain about this that I think it must be bugged and doesn't always work. Maybe it doesn't work when the posts are on different pages.
this post was submitted on 11 Mar 2026
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Maybe the complainers are using clients that don’t support the feature.
Is that how it's supposed to work? I use the default browser client and I've never noticed it. I have seen duplicate posts (ie the same post from the same community) on different pages. Maybe that's why.
Just came across an example of exactly what I'm talking about in my suggestion. The first post was hidden via the front page, and the second post was seen afterwards.
Userpage showing both posts, with one hidden: https://lemmy.ca/pictrs/image/74c84b3f-43a6-4d69-a08c-d84927e8007e.png
Second, unhidden post still visible on All feed: https://lemmy.ca/pictrs/image/fbc655af-a3b8-4df6-87f6-84719d6e7d98.png
I cant find these duplicate posts, can you share the URLs that you were viewing? Is it possible that these identical images actually have different URLs?
Here are the posts on lemmy.ca, they both have the same image url and are also shown as crossposts:
So these should be grouped together without any problem, not sure why it would fail.
I don't think I can check that now, but I can say that it wasn't working like that when I added the edit about it. When they were still up on the All feed, I had run across and hidden the first post, then a few pages later, I saw the second post on it's own. If I see it happen again, I will make note of it.
Yes I don't doubt that you were having this problem, another post was also complaining about it a few days ago. It's just that I cant think of any reason why this would happen if the image urls are identical.
I wish I could help out more. I will pass on if I run into the issue again. Thanks for looking into it.
Just found one. I've hidden this link twice now, but it's popped up yet again under a third post.
So the problem only occurs after you use "Hide Post"? That might be part of the problem, I suppose that deduplication only considers posts that are visible to you. Though I cant find the corressponding code right now to confirm it. Best if you open an issue in the lemmy repo.
Found it now, crosspost detection actually happens in the frontend. It only works if posts have the same url and are shown on the same page.
Opened an issue, but it will likely take a while to fix.
That's great! Thanks again.
@dessalines@lemmy.ml @nutomic@lemmy.ml I thought this feature already exists?
Yes but apparently its not working for some reason. My first guess is that these posts have identical looking images, but they are actually loaded from different urls.
How can one block a post..?
The drop-down menu under a post provides the option to "Hide Post" or "Unhide Post", depending on its current state.
https://lemmy.ca/pictrs/image/bb3e6eac-aa6a-4f9c-a581-64e654c64454.png
Wow, thanks. Not sure how I missed that all this time!