FYI, for those that like to update all of the things. Changelog that I saw:
- Fixes an issue where system search and search within Mail, Files and Notes might not work
- Addresses an issue where photos, links and other attachments might not display in the Messages details view
- Fixes an issue that could prevent apps from downloading content in the background
- Resolves issues that may prevent Mail from fetching new messages, and fail to include and quote original message content in Exchange accounts