Thank you so much for this quick response! That makes perfect sense so I will give it a wack and report back if I have any questions or concerns.

I ended up nesting a NSHostingController into a NSScrollView and allow AppKit to manage the interaction. That worked best for me since the view I was scrolling wasn't a large list that needed dequeuing behaviors.

When I use a custom formatter, the date no longer live-updates—is this the same for you?

I believe it’s probably a bug - I can confirm that Apples apps have the same behavior. No word from them back on feedback assistant yet.