Hi, I ran into such an unpleasant feature.
This is written in the logs, but the transfer of the PlayerStart does not help.
It seems he collides with himself and is destroyed without being born.
LogSpawn: Warning: SpawnActor failed because of collision at the spawn location [X=0.000 Y=0.000 Z=112.001] for [NewPawn_C]
LogGameMode: Warning: SpawnDefaultPawnAtTransform: Couldn’t spawn Pawn of type NewPawn_C at Rotation: Pitch 0.000000 Yaw 0.000000 Roll 0.000000
Translation: 0.000000 0.000000 112.000687
Scale3D: 1.000000 1.000000 1.000000