In my case these log messages were being printed:
LogSpawn: Warning: SpawnActor failed because of collision at the spawn location [X=0.000 Y=800.000 Z=482.000] for [PacmanBP_C]
LogGameMode: Warning: SpawnDefaultPawnAtTransform: Couldn’t spawn Pawn of type PacmanBP_C at Rotation: Pitch 0.000000 Yaw 0.000000 Roll 0.000000
Changing the collision preset in the pawn BP from Default to Pawn fixed it.