When trying to create or edit an existing PXE Configuration, clicking the Create Boot Image appears to do nothing. It should normally bring up Boot Disk Creator.
Corrupt WinPE environment
We upgraded Windows ADK (Preboot OS / Automation Environment) to the latest version for Windows 11, and this issue went away. The procedure for this is included in the Additional Information section below.
It may have been possible to reimport WinPE for Windows 11 x64 (screenshot below), and the issue should have gone away.
Steps to Update or Import the Windows Preboot OS: KB 178767