The game does not start on android 11

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The game stopped starting after I added the save and load option to it. The game starts on android 8.1, but does not start on android 11 - crashes without error. Also, a UE4Game folder with logs is created on android 8.1, but not on android 11. Please, help.

This is how my save file is created in GameModeBase:

void AMyGameModeBase::CheckSave()
{
	if (UGameplayStatics::DoesSaveGameExist(TEXT("save_01"), 0) == true)
	{
		GEngine->AddOnScreenDebugMessage(-1, 5.0f, FColor::Green, TEXT("Savefile already created"));
		return;
	}
	UMySaveGame* MySave = Cast<UMySaveGame>(UGameplayStatics::CreateSaveGameObject(UMySaveGame::StaticClass()));
	UGameplayStatics::SaveGameToSlot(MySave, TEXT("save_01"), 0);
	GEngine->AddOnScreenDebugMessage(-1, 5.0f, FColor::Green, TEXT("Savefile created"));
}