Someone added me to lists, which have slugs and data-list-id, but data-user-id value is empty (looks like that in html code: data-user-id=""). Therefore, I can’t see, who has created these lists and block his account. Is it a bug?
Where are you seeing this information in the API?
Actually, in Twitter web, not in API, but question is it possible to know list owner by list ID via API?
The supported methods for interacting with lists are described here. Anything you’re doing to inspect the HTML code is not supported, and for help with Twitter’s website or mobile apps you should use support.twitter.com. These forums are only for discussions of the developer platform.