Dorico is treating playback of a slur into a staccato with a space between the notes instead of using a legato overlap:
Since all notes are marked “Natural”, I’ll wager you are using the wrong Expression Map., possibly the one called “Default”, which is not for the Horn.
Craig, I think you’re right that Dorico ends the legato with the second note, rather than creating a transition to the third note. I’m sure this is designed behaviour, but I’ll make a note for us to review it in due course.
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