Pay off debt freeze with Outpost?

[marktlehrling]

Hi, I do also really enjoy the new client.
I think there is some bug with paying off debt. I'm not sure where it comes from though.
In game #2591 on frankfurt-test2, I started my turn 8 with 6 debt from Capital. Played Overlord as Outpost, then played 3 Copper and 1 Silver and clicked the debt button. It and the "End turn" button disappeared (and I still had 6 debt). I was able to undo, but always I came back to the same situation.

Edit: The reason is not debt but the Overlord-as-Outpost, as stated here.