Datetime format mismatch in "check user follows by channel" endpoint

In “check user follows by channel” endpoint in kraken v5
( https://dev.twitch.tv/docs/v5/reference/users/#check-user-follows-by-channel )
The response sample gives the created_at field with sub-second precision (just as the v5 api changes described)
But when I try it, the created_at in actual response does not comes with the sub-second precision as expected.
Is it a bug or just a coincidence that the actual create time did happen at the 0-microsecond?

Judging by the responses from other endpoints documented on that page and their actual responses, the docs for the endpoint you speak of are probably inaccurate.