Test Build Bug - Advent player

Hello,

I wish to report what I think is a bug where after changing homeworlds once in the game, I am unable to change Homeworlds again because the button is greyed out with a red text saying "Civilian orbit slots are being used". I was able to change homeworld's early in the game one time but after that, the button is greyed out with that text. I tried capturing a new planet that didn't have any civilian orbit structures and it was completely empty but the button was still greyed out with the text there. I tried trading with an allied AI for getting a new planet with no orbit structures

The map I'm playing on is the new Random 9 Player - Multi Star.

Please see attached save of the game. https://drive.google.com/file/d/16eE47hjuxac6CR3YCK9TJJd05aQ3dqKu/view?usp=drive_link