Titled this issue as "possible" because I may have forgotten a setting somewhere.
Login frontend. I did that as superuser
Fill profile and Agree to policy
Submit.
we get
and I agree is back to No
Note: I did receive the mail stating the last action

As this did not work, I can't submit a request for informations from the frontend menu item
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I can't reproduce, it works as expected for me.
If it's not a fresh install, did you apply this change in your #__privacy_consent table?
| Status | New | ⇒ | Closed |
| Closed_Date | 0000-00-00 00:00:00 | ⇒ | 2018-09-23 10:48:47 |
| Closed_By | ⇒ | infograf768 |
OK, closing as indeed using varchar 255 solves that precise issue.
Thanks for hint.
Maybe duplicate of #22212?