See the main entry for details, etc. As this issue is much better with Epic CL 37590157, this is likely related to unsynchronized multithread access.
The screenshot is the point of failure in code with that Epic CL integrated.
No repro steps other than to cook. The commandline from the log file is
Command Line: C:\p4\main\game\AE\AE.uproject -run=Cook -TargetPlatform=Windows -zenstore -unversioned -iterate -skipeditorcontent -ZenStore -fileopenlog -abslog=C:\p4\main\game\Engine\Programs\AutomationTool\Saved\Cook-2025.06.09-16.56.55.txt -stdout -CrashForUAT -unattended -NoLogTimes -UTF8Output