Pawns invisible / Not spawning in Custom Game Mode on new Level

Development Programming & Scripting AI
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I am starting out with a fresh Third Person project with Starter Content. I created two custom Game Modes (one BP, one C++) that spawn each player at different Player Starts. Sample C++ (BP does the exact same thing):

DeathMatch.h:

UCLASS()
class BALLOONO_API ADeathMatch : public AGameMode
{
	GENERATED_BODY()
	
	ADeathMatch(const FObjectInitializer& ObjectInitializer);

	virtual AActor* ChoosePlayerStart_Implementation(AController* Player) override;
};

DeathMatch.cpp:

ADeathMatch::ADeathMatch(const FObjectInitializer& ObjectInitializer)
{
	TSubclassOf<class APawn> defaultPawn;

	static ConstructorHelpers::FObjectFinder<UBlueprint> PawnBlueprint(TEXT("Blueprint'/Game/Game/Bomber.Bomber'"));
	if (PawnBlueprint.Object)
	{
		defaultPawn = (UClass*)PawnBlueprint.Object->GeneratedClass;
	}

	if(defaultPawn)
		DefaultPawnClass = defaultPawn;
}

AActor* ADeathMatch::ChoosePlayerStart_Implementation(AController* Player)
{
	for (TActorIterator<APlayerStart> ActorItr(GetWorld()); ActorItr; ++ActorItr)
	{
		auto playerStart = *ActorItr;

		if (!playerStart->ActorHasTag("Taken"))
		{
			playerStart->Tags.Add("Taken");

			return playerStart;
		}
	}

	return nullptr;
}

With the default Third Person level, I deleted the player and added several Player Start Actors. Testing the level shows each player spawning at each Player Start, awesome.

However this breaks on a new Level. After creating the new level, I setup 4 Player Start Actors. I set my Game Mode, and my Default Pawn Class. When the Default Pawn Class is one that I created or ThirdPersonCharacter, it spawns the camera at 0,0,0 (or uses a Camera that I place) but no Actor. This was additionally tested with a BP equivalent, using the Blueprint version of ThirdPersonCharacter.

Selecting SpectatorPawn does work, and the players can fly around. Additionally, the same Game Mode applied to a default Side Scroller project (with 4 Player Starts) creates 1 visible Pawn and 3 invisible Pawns, although the invisible ones can still play, collide, etc…

How can I get my Pawns to properly spawn?