Got it, i need to get all Actors from ULevel, not LevelStreaming. Like this:
UWorld* world = GetWorld();
auto StreamingLevels = world->GetStreamingLevels();
for (UStreamingLevel* StreamingLevel : StreamingLevels ) {
ULevel* level = StreamingLevel->GetLoadedLevel();
if(!level) continue;
for (AActor* Actor : level->Actors)
{ // Actor action }
}
And of course, it’s need to be loaded before.