Data layers changed a bit during the versions. How does we activate a data layer only when loading is finished? I can get bind event on changed state and check its state but it returns the loading state before the actual level finished loading. Setting up a delay is a workaround, but it makes all the rest pointless.
the absolute simplest way, put a manager actor in the DataLayer and call back on BeginPlay.
I found this useful anyway as it can act like a LevelBlueprint for presets or reference actors
the official way is probably to bind to the LevelStreamingSubsystem and compare against your expected DataLayer on load