[diggan]

Seems to have happened not because they deleted that specific issue but because they have disabled issues in general for that specific repository. Take a look at https://github.com/plaid/link and see there is no "Issues" tab. When doing that, it removes all existing issues.

[RyJones]

as an owner of multiple orgs, I dislike that I can't disable new issues while retaining history.

[sammnaser]

Indeed, I didn't notice that. In any case, the issue doesn't exist anymore, and the public discussion on this problem was wiped.