diff --git a/test/test_YoutubeDL.py b/test/test_YoutubeDL.py
index ce9666171..1e204e551 100644
--- a/test/test_YoutubeDL.py
+++ b/test/test_YoutubeDL.py
@@ -816,11 +816,15 @@ class TestYoutubeDL(unittest.TestCase):
             'webpage_url': 'http://example.com',
         }
 
-        def get_ids(params):
+        def get_downloaded_info_dicts(params):
             ydl = YDL(params)
-            # make a copy because the dictionary can be modified
-            ydl.process_ie_result(playlist.copy())
-            return [int(v['id']) for v in ydl.downloaded_info_dicts]
+            # make a deep copy because the dictionary and nested entries
+            # can be modified
+            ydl.process_ie_result(copy.deepcopy(playlist))
+            return ydl.downloaded_info_dicts
+
+        def get_ids(params):
+            return [int(v['id']) for v in get_downloaded_info_dicts(params)]
 
         result = get_ids({})
         self.assertEqual(result, [1, 2, 3, 4])
@@ -852,6 +856,22 @@ class TestYoutubeDL(unittest.TestCase):
         result = get_ids({'playlist_items': '2-4,3-4,3'})
         self.assertEqual(result, [2, 3, 4])
 
+        # Tests for https://github.com/ytdl-org/youtube-dl/issues/10591
+        # @{
+        result = get_downloaded_info_dicts({'playlist_items': '2-4,3-4,3'})
+        self.assertEqual(result[0]['playlist_index'], 2)
+        self.assertEqual(result[1]['playlist_index'], 3)
+
+        result = get_downloaded_info_dicts({'playlist_items': '2-4,3-4,3'})
+        self.assertEqual(result[0]['playlist_index'], 2)
+        self.assertEqual(result[1]['playlist_index'], 3)
+        self.assertEqual(result[2]['playlist_index'], 4)
+
+        result = get_downloaded_info_dicts({'playlist_items': '4,2'})
+        self.assertEqual(result[0]['playlist_index'], 4)
+        self.assertEqual(result[1]['playlist_index'], 2)
+        # @}
+
     def test_urlopen_no_file_protocol(self):
         # see https://github.com/ytdl-org/youtube-dl/issues/8227
         ydl = YDL()
diff --git a/youtube_dl/YoutubeDL.py b/youtube_dl/YoutubeDL.py
index 15e03c239..a55a0a109 100755
--- a/youtube_dl/YoutubeDL.py
+++ b/youtube_dl/YoutubeDL.py
@@ -991,7 +991,7 @@ class YoutubeDL(object):
                     'playlist_title': ie_result.get('title'),
                     'playlist_uploader': ie_result.get('uploader'),
                     'playlist_uploader_id': ie_result.get('uploader_id'),
-                    'playlist_index': i + playliststart,
+                    'playlist_index': playlistitems[i - 1] if playlistitems else i + playliststart,
                     'extractor': ie_result['extractor'],
                     'webpage_url': ie_result['webpage_url'],
                     'webpage_url_basename': url_basename(ie_result['webpage_url']),
diff --git a/youtube_dl/extractor/twentyfourvideo.py b/youtube_dl/extractor/twentyfourvideo.py
index 2830c212e..74d14049b 100644
--- a/youtube_dl/extractor/twentyfourvideo.py
+++ b/youtube_dl/extractor/twentyfourvideo.py
@@ -17,7 +17,7 @@ class TwentyFourVideoIE(InfoExtractor):
     _VALID_URL = r'''(?x)
                     https?://
                         (?P<host>
-                            (?:(?:www|porno)\.)?24video\.
+                            (?:(?:www|porno?)\.)?24video\.
                             (?:net|me|xxx|sexy?|tube|adult|site|vip)
                         )/
                         (?:
@@ -62,6 +62,9 @@ class TwentyFourVideoIE(InfoExtractor):
     }, {
         'url': 'https://www.24video.vip/video/view/1044982',
         'only_matching': True,
+    }, {
+        'url': 'https://porn.24video.net/video/2640421-vsya-takay',
+        'only_matching': True,
     }]
 
     def _real_extract(self, url):