I can confirm that the Compressed File Size literally appears and disappears randomly! Right now I have the same build open in two tabs, one has the Compressed File Size displayed, the other is missing it completely. It is a build from two days ago that is fully approved. Most of the time the Compressed File Size will not be displayed though, it's some rare thing you happen to see now and again lol.
Topic:
App Store Distribution & Marketing
SubTopic:
App Store Connect
Tags: