UnityWebRequestTexture.GetTexture使ったときにテクスチャがリークするパターン

DownloadTextureTest.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Networking;

public class DownloadTextureTest : MonoBehaviour
{
    [SerializeField]
    string url1 = null;
    [SerializeField]
    string url2 = null;

    // テクスチャがリークする
    IEnumerator DownloadTest1(string url)
    {
        using (var uwr = UnityWebRequestTexture.GetTexture(url))
        {
            yield return uwr.SendWebRequest();

            if (!uwr.isNetworkError && !uwr.isHttpError)
            {
                Debug.Log("test1 complete.");
            }
            else
            {
                Debug.LogError(uwr.error);
            }
        }

        System.GC.Collect();
        Resources.UnloadUnusedAssets();
    }

    // リークしない
    IEnumerator DownloadTest2(string url)
    {
        using (var uwr = UnityWebRequestTexture.GetTexture(url))
        {
            yield return uwr.SendWebRequest();

            if (!uwr.isNetworkError && !uwr.isHttpError)
            {
                var tex = DownloadHandlerTexture.GetContent(uwr);
                Debug.Log("test2 complete.");
            }
            else
            {
                Debug.LogError(uwr.error);
            }
        }

        System.GC.Collect();
        Resources.UnloadUnusedAssets();
    }

    void Start()
    {
        StartCoroutine(DownloadTest1(url1));
        StartCoroutine(DownloadTest2(url2));
    }

    private void OnGUI()
    {
        if (GUILayout.Button("Download Test1", GUILayout.Width(200), GUILayout.Height(100)))
        {
            StartCoroutine(DownloadTest1(url1));
        }
        if (GUILayout.Button("Download Test2", GUILayout.Width(200), GUILayout.Height(100)))
        {
            StartCoroutine(DownloadTest2(url2));
        }
    }
}