This feature is a lifesaver for fediverse. It allows you to see from a general perspective, reduces confusion and creates a more organized forum environment. Thank you to everyone who has already used this feature and I highly recommend everyone to use it.
Unless they’ve changed how it works I can confirm.
Some months ago I was testing lemmy in my local I used the same URL to create a new post, it never showed up in the ui, it was because Lemmy treated it as a crosspost and hid it under the older one.
At that time it was only a crosspost jf the URL was the same, I’m not so sure about the title, but the body could be different.
The thing would be to verify if this grouping is being done by the UI or by the server, which might explain some UIs showing duplicated posts.
AFAIK, the grouping is done by the API only when you’re viewing a post and by the UI when you’re browsing the feed. Unless 0.19.4 changed this, the call to list posts doesn’t return crosspost data and it has to be done client-side. I’ve grumbled about this a lot lol.