Latest youtube extractor doesn't work as in previous youtube-dl 2020.06.06 version

[radiolondra]

Ubuntu 3.7
Youtube-DL 2020.06.16.1

Before this new Youtube-DL version 2020.06.16.1, using YTDL 2020.06.06 version the following piece of code worked fine, reporting 20 videos per query:

class ThreadClass(threading.Thread):

    def __init__(self, thread_id, name, query, page, callback):
        threading.Thread.__init__(self)
        self.thread_id = thread_id
        self.name = name
        self.callback = callback
        # self.query = query
        self.page = page
        self.query = "https://www.youtube.com/results?search_query=" + query + "&sp=CAMSAhAB&page=" + str(self.page)

    def run(self):
        # clear the scroll view
        app = MDApp.get_running_app()
        app.root.ids.md_results.clear_widgets()

        with youtube_dl.YoutubeDL(
                {
                    "forcejson": True,
                    # "dump_single_json": True,
                    "simulate": True,
                    "logger": SearchResultsCatcher(),
                    "default_search": "ytsearch",
                    # 'progress_hooks': [my_hook],
                }
        ) as ydl:
            ydl.download([self.query])

        self.callback()


class SearchResultsCatcher(object):

    def __init__(self):
        object.__init__(self)

    def debug(self, msg):
        if msg.strip()[0] == "{":
            msg = msg.replace('\\r', '').replace('\\n', '')
            j = json.loads(msg)

            clean_desc = j['description'].replace('"', ' ')
            clean_title = j['title'].replace('"', ' ')

            """
            format_str = ''
            for vid in j["formats"]:
                if vid['vcodec'] != "none" and vid['acodec'] != "none":
                    format_str = format_str + \
                        '{"videoext": "' + vid['ext'] + '",' + \
                        '"filesize": "' + str(vid['filesize']) + '",' + \
                        '"format": ' + vid['format'] + '",' + \
                        '"videourl": ' + vid['url'] + '}'

            if format_str != '':
                format_str = format_str.replace('}', '},')
                format_str = format_str[:-1]

            format_str = '"videos":[' + format_str
            format_str = format_str + ']},'
            """
            app = MDApp.get_running_app()

            id = j['id']
            title = clean_title
            thumb = j['thumbnail']
            description = clean_desc
            views = '{:,}'.format(j['view_count'])
            url = j['webpage_url']

            s = ItemDrawer(image=thumb,
                           title=title,
                           views='Views: ' + views,
                           description=description,
                           url=url,
                           alt_text="Watch on YOUTUBE")
            app.root.ids.md_results.add_widget(s)

    def warning(self, msg):
        pass

    def error(self, msg):
        pass

With the new Youtube-DL version 2020.06.16.1, the previous code doesn't work anymore, reporting ZERO videos.

[youtube:search_url] marooned: Downloading webpage
[download] Downloading playlist: marooned
[youtube:search_url] playlist marooned: Downloading 0 videos
[download] Finished downloading playlist: marooned

The query passed to obtain this result (0 videos) was a semplified version of the normally used query, without order filter (&sp=CAMSAhAB) and page number (&page=1):
https://www.youtube.com/results?search_query=marooned

Please refer to issue #25560

How can I solve this problem? What have I to change in my code to have the same result as I had before the new Youtube-DL 2020.06.16.1 release?