Ash and Dawn didn't just not do a High Touch, they literally didn't actually interact.
I like what they did with her and Koharu, Dawn used to be almost as much as a protagonist as Ash, and they shared many parallels because of that, so giving Dawn a relationship that mirrors Ash and Go's is great.
But half of the point of and old character returning is watching them interact with Ash again, and they just completely skipped that in favor of the new relationship between her and Koharu. But the worst part is that Dawn was easily Ash's closest friend, even Best Wishes got that right when she returned there.
I like the way this series handles continuity, even in this episode there were some unexpected call backs, but they dropped the ball when I cared the most, and I think I lost any faith I still had in it.