con-256×256.png missing

Seems there’s no file plugins/creative-commons/assets/icon-256×256.png

It’s used in the top right in the settings page.

And the code where it’s loaded is: https://github.com/creativecommons/wp-plugin-creativecommons/blob/f9a3eaf8163f55c5fd10a7a2aeab9e4922c15dc2/includes/class-creativecommons.php#L1244