It's only been a week since Microsoft released Windows Server 2019 Insider Preview build 17709, but it's time for a new one. Build 17713 is now available, and once again, it comes alongside of a new SDK Preview build of the same number.
This build doesn't contain any new features. The main features that Microsoft wants Insiders to test though, is In-place OS Upgrade from Windows Server 2012 R2 or Windows Server 2016, and application compatibility.
Microsoft also didn't list any fixes, but it did list some known issues:
[NEW] Server Core App Compatibility FoD Preview 17713 for Windows Server Core is not available due to a blocking installation failure.
On a recent preview release of Server Core, the Advanced Query Syntax (AQS) parser may fail if the default language and locale are changed to something other than US English. If the AQS parser is not working, search functionality in Exchange does not work.
Creating or modifying environment variables by using setx fails on a system running in a Nano Container (that is, Nano Server as a container image). On an affected system, setx requires a specific path in the registry, HKCU\Environment\, to exist by default. You can work around this issue by changing where the variable is stored in the registry, or you can add the expected registry path before executing setx commands. To specify that the variable be set for system-wide use in HKLM rather than in HKCU, the default, add the /M switch to a setx command. To instead add the expected registry path, run reg add HKCU\Environment before executing setx commands.
The Virtual Machine Management Service (VMMS) may experience an error, APPLICATION_FAULT_INVALID_POINTER_READ, in Cluster Manager.
Editing or creating policies for AppLocker can cause the MMC snap-in to crash when generated rules for a packaged app.
This build will expire on December 14, and it's not supported for use in production environments.
You can download Windows Server 2019 Insider Preview build 17713 here, along with a new preview for Windows Admin Center.