diff --git a/test/test_YoutubeDL.py b/test/test_YoutubeDL.py
index 5a0dabeb6..63ef50e1a 100644
--- a/test/test_YoutubeDL.py
+++ b/test/test_YoutubeDL.py
@@ -137,7 +137,7 @@ class TestFormatSelection(unittest.TestCase):
         test('webm/mp4', '47')
         test('3gp/40/mp4', '35')
         test('example-with-dashes', 'example-with-dashes')
-        test('all', '35', 'example-with-dashes', '45', '47', '2')  # Order doesn't actually matter for this
+        test('all', '2', '47', '45', 'example-with-dashes', '35')
         test('mergeall', '2+47+45+example-with-dashes+35', multi=True)
 
     def test_format_selection_audio(self):
@@ -520,7 +520,7 @@ class TestFormatSelection(unittest.TestCase):
         ydl = YDL({'format': 'all[width>=400][width<=600]'})
         ydl.process_ie_result(info_dict)
         downloaded_ids = [info['format_id'] for info in ydl.downloaded_info_dicts]
-        self.assertEqual(downloaded_ids, ['B', 'C', 'D'])
+        self.assertEqual(downloaded_ids, ['D', 'C', 'B'])
 
         ydl = YDL({'format': 'best[height<40]'})
         try:
diff --git a/test/test_all_urls.py b/test/test_all_urls.py
index 68c1c68d3..2d89366d4 100644
--- a/test/test_all_urls.py
+++ b/test/test_all_urls.py
@@ -38,7 +38,6 @@ class TestAllURLsMatching(unittest.TestCase):
         assertTab('https://www.youtube.com/AsapSCIENCE')
         assertTab('https://www.youtube.com/embedded')
         assertTab('https://www.youtube.com/playlist?list=UUBABnxM4Ar9ten8Mdjj1j0Q')
-        assertTab('https://www.youtube.com/course?list=ECUl4u3cNGP61MdtwGTqZA0MreSaDybji8')
         assertTab('https://www.youtube.com/playlist?list=PLwP_SiAcdui0KVebT0mU9Apz359a4ubsC')
         assertTab('https://www.youtube.com/watch?v=AV6J6_AeFEQ&playnext=1&list=PL4023E734DA416012')  # 668
         self.assertFalse('youtube:playlist' in self.matching_ies('PLtS2H6bU1M'))
diff --git a/test/test_youtube_lists.py b/test/test_youtube_lists.py
index e831393e4..d9638658d 100644
--- a/test/test_youtube_lists.py
+++ b/test/test_youtube_lists.py
@@ -26,29 +26,31 @@ class TestYoutubeLists(unittest.TestCase):
     def test_youtube_playlist_noplaylist(self):
         dl = FakeYDL()
         dl.params['noplaylist'] = True
-        ie = YoutubePlaylistIE(dl)
+        ie = YoutubeTabIE(dl)
         result = ie.extract('https://www.youtube.com/watch?v=FXxLjLQi3Fg&list=PLwiyx1dc3P2JR9N8gQaQN_BCvlSlap7re')
         self.assertEqual(result['_type'], 'url')
-        self.assertEqual(YoutubeIE().extract_id(result['url']), 'FXxLjLQi3Fg')
+        self.assertEqual(YoutubeIE.extract_id(result['url']), 'FXxLjLQi3Fg')
 
     def test_youtube_course(self):
+        print('Skipping: Course URLs no longer exists')
+        return
         dl = FakeYDL()
         ie = YoutubePlaylistIE(dl)
         # TODO find a > 100 (paginating?) videos course
         result = ie.extract('https://www.youtube.com/course?list=ECUl4u3cNGP61MdtwGTqZA0MreSaDybji8')
         entries = list(result['entries'])
-        self.assertEqual(YoutubeIE().extract_id(entries[0]['url']), 'j9WZyLZCBzs')
+        self.assertEqual(YoutubeIE.extract_id(entries[0]['url']), 'j9WZyLZCBzs')
         self.assertEqual(len(entries), 25)
-        self.assertEqual(YoutubeIE().extract_id(entries[-1]['url']), 'rYefUsYuEp0')
+        self.assertEqual(YoutubeIE.extract_id(entries[-1]['url']), 'rYefUsYuEp0')
 
     def test_youtube_mix(self):
         dl = FakeYDL()
-        ie = YoutubePlaylistIE(dl)
-        result = ie.extract('https://www.youtube.com/watch?v=W01L70IGBgE&index=2&list=RDOQpdSVF_k_w')
-        entries = result['entries']
+        ie = YoutubeTabIE(dl)
+        result = ie.extract('https://www.youtube.com/watch?v=tyITL_exICo&list=RDCLAK5uy_kLWIr9gv1XLlPbaDS965-Db4TrBoUTxQ8')
+        entries = list(result['entries'])
         self.assertTrue(len(entries) >= 50)
         original_video = entries[0]
-        self.assertEqual(original_video['id'], 'OQpdSVF_k_w')
+        self.assertEqual(original_video['id'], 'tyITL_exICo')
 
     def test_youtube_toptracks(self):
         print('Skipping: The playlist page gives error 500')
@@ -68,10 +70,10 @@ class TestYoutubeLists(unittest.TestCase):
         entries = list(result['entries'])
         self.assertTrue(len(entries) == 1)
         video = entries[0]
-        self.assertEqual(video['_type'], 'url_transparent')
+        self.assertEqual(video['_type'], 'url')
         self.assertEqual(video['ie_key'], 'Youtube')
         self.assertEqual(video['id'], 'BaW_jenozKc')
-        self.assertEqual(video['url'], 'BaW_jenozKc')
+        self.assertEqual(video['url'], 'https://www.youtube.com/watch?v=BaW_jenozKc')
         self.assertEqual(video['title'], 'youtube-dl test video "\'/\\ä↭𝕐')
         self.assertEqual(video['duration'], 10)
         self.assertEqual(video['uploader'], 'Philipp Hagemeister')
diff --git a/yt_dlp/YoutubeDL.py b/yt_dlp/YoutubeDL.py
index e078e62ef..1f1b4ccd4 100644
--- a/yt_dlp/YoutubeDL.py
+++ b/yt_dlp/YoutubeDL.py
@@ -2014,7 +2014,7 @@ class YoutubeDL(object):
                         yield from _check_formats(ctx['formats'][::-1])
                 elif format_spec == 'mergeall':
                     def selector_function(ctx):
-                        formats = list(_check_formats(ctx['formats'][::-1]))
+                        formats = list(_check_formats(ctx['formats']))
                         if not formats:
                             return
                         merged_format = formats[-1]
diff --git a/yt_dlp/extractor/youtube.py b/yt_dlp/extractor/youtube.py
index 1fbdcd98b..632129bc6 100644
--- a/yt_dlp/extractor/youtube.py
+++ b/yt_dlp/extractor/youtube.py
@@ -3467,9 +3467,6 @@ class YoutubeTabIE(YoutubeBaseInfoExtractor):
         'note': 'inline playlist with not always working continuations',
         'url': 'https://www.youtube.com/watch?v=UC6u0Tct-Fo&list=PL36D642111D65BE7C',
         'only_matching': True,
-    }, {
-        'url': 'https://www.youtube.com/course?list=ECUl4u3cNGP61MdtwGTqZA0MreSaDybji8',
-        'only_matching': True,
     }, {
         'url': 'https://www.youtube.com/course',
         'only_matching': True,