Hi @rroethof and @jchrichton,
The discussed issue was presented a few months ago, but the solution is only on the Greenbone community feed administrator side. You can proceed with a “hack” on how to rewrite the date and avoid the message “Too old” but it is not a solution, just a “hack”.
I can confirm the same behavior at this time.
see my post here on how to achieve it:
I believe in the fast solution on Feed.