Yes, this is how it works in lemmy-ui. In this following example someone posted to !technology@beehaw.org and I pressed the cross-post button and cross-posted it to !firefox@lemmy.ml:
And if you cross post it to more then one there will be just a list of them.
OP, like me, probably doesn’t/didn’t know that the website interface for Lemmy has a solution for this and it’s actually an app problem. So to OP it is a “Lemmy” gripe until we’re given more info. :)
I often crosspost (with the crosspost button) my memes across multiple communities but I occasionally get annoyed comments from people who subscribe to all the shitposting subs... I guess even the official function doesn't always work as intended?