Thank you to everyone who posted suggestions and workarounds.

I believe I've discovered a workaround for this pushWindow bug. If I add the .restorationBehavior(.disabled) scene modifier to the WindowGroup corresponding to the pushed window, the bug doesn't happen. When dismissWindow is called on a pushed window, the parent window reappears in the expected location.

I believe I've discovered a workaround for this pushWindow bug. If I add the .restorationBehavior(.disabled) scene modifier to the WindowGroup corresponding to the pushed window, the bug doesn't happen. If the user pins a pushed window to the wall, the window doesn't disappear, and the app and all other apps that may call pushWindow aren't bricked until the next device reboot.

I was able to reproduce this issue in visionOS 26.2.