I just updated my iPhone to 26.5 beta. The syncing is now working on the iPhone. I have Mac, AppleTV and iPhone all running at the same time, and any change to SwiftData on any of the 3 devices immediately updates on the other 2.

Bug report Filed - FB22343127

Just to add one more piece to this... Make a change on the Mac AppleTV makes the change instantly Apple Watch makes the change instantly iPhone only updates after you leave the app and launch it again iPad only updates after you leave the app and launch it again

-It is the iPhone not receiving the notification to update. Steps to reproduce Change property on Mac iPhone app is active, no changes received (even after 2 hours) Swipe to home screen on iPhone open iPhone app SwiftData syncs on iPhone and shows changes that were made on the Mac (Again, this worked 48 hours ago, and the only change that was made was updating all devices to iOS26.4)

In the example I used in the question, the bridge will be closed for a very long time. I used this as I knew that the road closed symbol would be there for some time, so anyone that might be able to answer the question would see what I'm talking about. But in the real world, roads get closed on a daily basis, then reopened (accidents, construction, etc). Apple Maps appears to show the road closed symbol automatically, yet when I use the code above, it doesn't show the symbol, just the live reporting that changes the color to that dark red. I'd like my project to show these road closed symbols as well... if I could figure out what they are called.