GET https://api.twitch.tv/helix/users does not return created_at

The Helix API endpoint https://api.twitch.tv/helix/users does not return a created_at property in the response even though the doco https://dev.twitch.tv/docs/api/reference#get-users states it should.

Is this a temporary issue or has it been permanently removed?

it was added to the documentation in error

Helix never had it in the first place

Relevant uservoice to upvote adding it