whereas this was not the case yesterday.
Is this a bug or a feature?
Thank you for spotting this. This was indeed an unintended side-effect when introducing a new close reason for Teams. I didn't have in mind that our moderator tools consider all close reasons when showing filter options.
Sorry for the confusion. The problem's fixed now and the second off-topic option is gone.
That's a bug due to Teams.
As can be seen in this query, the second off topic reason is a new close reason meant for Teams:
(If you'll view the filters source code you'll see the input ID is
So, this close reason should not appear on the regular Q&A sites.