The PlayerCameraManager->OnBlendComplete() delegate is not getting called when running a game in a standalone network mode without any networking.
Repro steps require C++ code to register a delegate to PlayerCameraManager->OnBlendComplete()
Then simply call SetViewTargetWithBlend() with some non-zero blend, and check that the delegate gets called.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-291346 in the post.