TSoftObjectPtr in Data Asset cannot be loaded?

Development Programming & Scripting
,
1

My Data Asset:

.h file

#pragma once

#include "CoreMinimal.h"
#include "Core/GameAssetManager.h"
#include "Engine/DataAsset.h"
#include "PlayerCharacter.generated.h"

/** Base class for all playable characters and mods */
UCLASS()
class DMTest_API UPlayerCharacter : public UPrimaryDataAsset
{
	GENERATED_BODY()

public:
	UPlayerCharacter(): WalkSpeed(0), RunSpeed(0)
	{
		ItemType = UGameAssetManager::PlayerCharacter;
	}

	// Type of this asset, set in native parent class
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = Character)
	FPrimaryAssetType ItemType;

	// User-visible short name
	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = Character)
	FText Name;

	// User-visible long description
	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = Character)
	FText Description;

	// Icon to display
	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = Character)
	TSoftObjectPtr<UTexture2D> Icon;

	//Skeletal mesh of this character
	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = Character)
	TSoftObjectPtr<USkeletalMesh> CharacterMesh;

	// Walk speed
	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = Movement)
	int32 WalkSpeed;

	// Walk speed
	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = Movement)
	int32 RunSpeed;

	/**
	 * @return Returns the logical name, equivalent to the primary asset id
	 */
	UFUNCTION(BlueprintCallable, Category = Item)
	FString GetIdentifierString() const;

	/** Overridden to use saved type */
	virtual FPrimaryAssetId GetPrimaryAssetId() const override;
};

.cpp file

#include "Characters/PlayerCharacter.h"

FString UPlayerCharacter::GetIdentifierString() const
{
	return GetPrimaryAssetId().ToString();
}

FPrimaryAssetId UPlayerCharacter::GetPrimaryAssetId() const
{
	return FPrimaryAssetId(ItemType, GetFName());
}

I have 2 properties for the data in my character class

UPROPERTY(EditAnywhere, BlueprintReadOnly, Category="Character Data", meta=(AllowPrivateAccess="true"))
TSoftObjectPtr<UPlayerCharacter> CharacterDataAsset;

UPROPERTY(EditAnywhere, BlueprintReadOnly, Category="Character Data", meta=(AllowPrivateAccess="true"))
TObjectPtr<USkeletalMesh> SkeletalMesh;

I can load everything from CharacterDataAsset but CharacterMesh, if I change TSoftObjectPtr to TObjectPtr, then I can load CharacterMesh. So, what did I do wrong?