yt-dlp自定义BuzzSprout提取器配置后未生效问题求助

我想给BuzzSprout平台做一个自定义提取器，除了generic通用提取器已有的功能外，还希望能额外提取视频的season（季数）和episode（集数）信息。

我已经写好脚本并保存到了这个路径：
/usr/lib/python3/dist-packages/yt_dlp/extractor/buzz.py

脚本内容如下：

from yt_dlp.extractor.common import InfoExtractor
import re

class BuzzSproutIE(InfoExtractor):
    IE_NAME = 'buzzsprout'
    _VALID_URL = r'https://www.buzzsprout.com/.*/(?P<id>[^/?#&]+)$'

    def _real_extract(self, url):
        video_id = self._match_id(url)
        webpage = self._download_webpage(url, video_id)

        # Extract the season number.
        season = self._search_regex(
            r'<span class="whitespace-nowrap">Season (\d+)</span>',
            webpage,
            'season',
            fatal=False
        )
        # Extract the episode number.
        episode = self._search_regex(
            r'<span class="whitespace-nowrap">Episode (\d+)</span>',
            webpage,
            'episode',
            fatal=False
        )

        return {
            'id':      video_id,
            'title':   self._html_search_regex(r'<title>([^<]+)</title>', webpage, 'title'),
            'season':  season,
            'episode': episode,
        }

另外，我也在/usr/lib/python3/dist-packages/yt_dlp/extractor/_extractors.py文件里添加了这行导入语句：

from .buzz import BuzzSproutIE

但现在遇到了问题：运行yt-dlp --list-extractors | grep -i buzz的时候，根本看不到我这个自定义的提取器，而且BuzzSprout的链接依然是被generic提取器在处理，完全没用到我写的这个。

请问我哪里漏了步骤吗？

备注：内容来源于stack exchange，提问作者pavd