I THINK it might be related to this -
Avoid trying to shut down the editor
during loads and slow tasks
#rb none
#jira UE-46063 https://github.com/EpicGames/UnrealEngine/commit/3e128c7c35e06bc38b42e90a676e182bf5e0ae15
it falls consistent to my failures, when the map is too big or has a lot of saved assets to load is when it fails
err but that fix is for the editor, mine happens in dedicated server 