diff --git a/yt_dlp/extractor/common.py b/yt_dlp/extractor/common.py
index d5607296df..fb8b46066f 100644
--- a/yt_dlp/extractor/common.py
+++ b/yt_dlp/extractor/common.py
@@ -1675,9 +1675,9 @@ class InfoExtractor:
                 'ext': mimetype2ext(e.get('encodingFormat')),
                 'title': unescapeHTML(e.get('name')),
                 'description': unescapeHTML(e.get('description')),
-                'thumbnails': [{'url': unescapeHTML(url)}
-                               for url in variadic(traverse_obj(e, 'thumbnailUrl', 'thumbnailURL'))
-                               if url_or_none(url)],
+                'thumbnails': traverse_obj(e, (('thumbnailUrl', 'thumbnailURL', 'thumbnail_url'), {
+                    'url': ({unescapeHTML}, {self._proto_relative_url}, {url_or_none}),
+                })),
                 'duration': parse_duration(e.get('duration')),
                 'timestamp': unified_timestamp(e.get('uploadDate')),
                 # author can be an instance of 'Organization' or 'Person' types.