A couple of days ago, Microsoft released a new cumulative update KB4522355 (OS Build 18362.449) for Windows 10 May 2019 Update (Windows 10 version 1903) devices; which included several bug fixes related to Microsoft Narrator, Windows Search Indexer, VPN connectivity, sleep transition issues and more.

Along with the update, all users also mistakenly received a “Cumulative Update for Autopilot”, under KB4523786.  This particular update performs quality improvements for devices configured by Windows Autopilot and is not actually a “compulsory update” for Windows 10 1903.

Though no compatibility problems or reliability errors have been reported yet, Microsoft has advised users to not install update KB4523786, as it was delivered in error.

Source: Winfuture