Board Thread:Game Discussion/@comment-33625305-20190731205609/@comment-27370080-20190805193036

The app is uploaded to the distribution servers weeks to a month in advance. Very rarely, and error might be discovered by [them] that's critical enough to warrant a patch before the release. Thus instead of seeing 7.4.5, you might see 7.4.6 (as one example). Even those late loads are still delivered to us on time.

In Summary--it's Google.