Since upgrading to 3.10.12 all tags get removed, with this error in the logs:

2020-01-27 07:29:46,109 [gpodder.extensions] ERROR: Error in C:\Program Files (x86)\gPodder\share\gpodder\extensions\tagging.py in on_episode_downloaded: "'subtitle' is not a valid key"
Traceback (most recent call last):
File "C:\Program Files (x86)\gPodder\lib\python3.8\site-packages\gpodder\extensions.py", line 83, in handler
cb_res = callback(*args, **kwargs)
File "C:\Program Files (x86)\gPodder\share\gpodder\extensions\tagging.py", line 200, in on_episode_downloaded
self.write_info2file(info, episode)
File "C:\Program Files (x86)\gPodder\share\gpodder\extensions\tagging.py", line 278, in write_info2file
audio.write_basic_tags(self.container.config.modify_tags,
File "C:\Program Files (x86)\gPodder\share\gpodder\extensions\tagging.py", line 99, in write_basic_tags
audio.tags['subtitle'] = self.subtitle
File "easyid3.py", line 229, in setitem
mutagen.easyid3.EasyID3KeyError: "'subtitle' is not a valid key"