Unlike it’s said on UE-55700’s Description, the project doesn’t need to use the new audio engine. A bright new project that has a MediaSoundComponent added to any actor in the level (even the default Floor mesh) will hang in the garbage collection loop on level unload.
It’s such a shame that the target fix is set to 4.21. It means we won’t be able to play sound from movies in levels until then. Could you Epic devs fix it sooner? We have no other option to hear the sound from MediaPlayer movies. Unless it’s in a PersistentLevel and the rest of the game is fully composed of streamed levels, which is unlikely to happen IMHO.
On a side note, this guy falls in the same GC loop, but his issue seem to be related to a UTexture2D object.