Canvas Is Not Updating in Xcode 26

I just updated to Tahoe 26 and Xcode 26, and now a SwiftUI project that was working just fine, simply shows a blank canvas. I closed Xcode and reopened, but get the same results.

Note that there is no error message and the project builds and displays normally.

Steps to blank canvas:

1. Open Xcode
2. I see Canvas Paused
3. Click on the circle
4. The Form opens with a blank screen
5. Build the project
6. The Form opens with all controls showing

Jim