Running Beta 4.
The notification stated c. 146 MB was available for download and when i allowed it I saw this

Bug: Indexing had not started
EDIT: I appreciate the need for a message with resources being updated, but "library is being indexed" will cause confusion.
After indexing started I saw this

When i restarted it was Beta 5 and a similar notification was being shown (indexing continued).
The indexer log showed it was Beta 5, so had the update proceeded in the background, updating the indexer but waiting for a restart to update the application?
Why no notification about the software update?