"The Flat Dictionary" mission doesn't accept

I would like to give some feedback about ...

From: https://py.checkio.org/mission/flatten-dict/solve/

HTTP_USER_AGENT:

Mozilla/5.0 (Windows NT 10.0; WOW64; rv:48.0) Gecko/20100101 Firefox/48.0

Hi,

I've completed "The Flat Dictionary" mission, but it seems that I cannot submit my solve. Where the publish button use to be, I see ""The Flat Dictionary" mission doesn't accept solutions". I'm just wondering if this is intentional for some missions.

Thank you, Derek