Notation like the attachment is standard and normal in classical music. One of the nice things about Dorico is that it does this automatically, unlike other notation software where you have to fake it and it doesn’t play back properly either.
That is no different to what Dorico did importing the MusicXML file, except the notation wasn’t used in a sensible way.
In any case, as the link in my previous post shows, the original Musescore file contained EXACTLY the same notation as Dorico produced.
