It posts the link, but not an image of the link. So you still need to click through to see what is being referenced
I think this has been possible as long as I have been using Ivory the past 9(?) months, but has not always revealed itself in the same manner, or same number of steps, and perhaps even presenting itself differently, that is, sometimes showing the full toot/post in entirety within.
I haven’t stumbled on it lately. A/B testing? Gradual rollout?