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A number of things has changed in the AudioClip. First, there is no longer a 3D flag on the asset. This flag has been moved into the AudioSource in form of the Spatial Blend slider allowing you to, at runtime, morphing sounds from 2D to 3D. Old projects will get imported in such a way that AudioSource’s on GameObjects in the scene that have a clip assigned will get their Spatial Blend parameter set up according to the old 3D flag of the AudioClip. For obvious reasons this is not possible for scripts that dynamically assign clips to sources, so this requires manual fixing.While the default setting for the old 3D property was true, by default in the new system, the default of the Spatial Blend parameter is set to 2D
Probably isn't too hard to edit the Play Sound action so you can also set the Spatial Blend