It only happens with that particular Alert modifier, with other ones it works fine.

You're missing the point, the problem isn't with the counter, that was just to demonstrate the problem with Alert.

The PulsingCircle1 animation sequence does need to play in reverse after playing forward because I'm trying to create a glow effect that fades in and out I'm try the sample code and I'm not seeing any animation, the blue ring is just blinking on and off.

Will this be fixed in iOS16?

Nevermind, the issue was that I forgot to transform the regionOfInterest from AV coordinates to Vision Coordinates.

I just updated to iOS 14.6 / Xcode 12.5 and started getting a torrent of these messages, they seem to appear in the console for every single network call.

Ok going by this line from the documentation, I think the answer is yes:Adding an anchor to the session helps ARKit to optimize world-tracking accuracy in the area around that anchor, so that virtual objects appear to stay in place relative to the real world. If a virtual object moves, remove the corresponding anchor from the old position and add one at the new position.