How to rename an asset with IAssetTools::RenameAssets() in 4.27.2

Development Pipeline & Plugins
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I’m trying to rename an asset in UE 4.27.2 with code like:

	// asset: UObject of the asset to rename
	// newName: name string like "Snowman"
	FAssetToolsModule& AssetToolsModule = FModuleManager::LoadModuleChecked<FAssetToolsModule>("AssetTools");
	UObject* uObject = asset.GetAsset();
	TArray<FAssetRenameData> AssetsAndNames;
	const FString PackagePath = FPackageName::GetLongPackagePath(uObject->GetOutermost()->GetName());
	const FString NewName(UTF8_TO_TCHAR(newName));
	new(AssetsAndNames) FAssetRenameData(uObject, PackagePath, NewName);
	return AssetToolsModule.Get().RenameAssets(AssetsAndNames)

The IAssetTools::RenameAssets() method returned true but the asset name in content browser didn’t change and I get error message in output log like:

LogPackageName: Error: DoesPackageExist: DoesPackageExist FAILED: 'Snowman' is not a standard unreal filename or a long path name. Reason: Path should start with a '/'

If I change the string variable newName to the full path starts with a ‘/’，the IAssetTools::RenameAssets() method failed with following error message:

/Game/Snow -  /Game/Snow to /Game/Game/Snowman.Game/Snowman: Name may not contain the following characters: /

It seems like some part of logic in IAssetTools::RenameAssets() require the newName to starts with ‘/’ and another part of logic require the newName not to contain ‘/’.

Is this an engine bug?