What a day.
After struggling to export my now playtest-worthy pile of attributes for nearly an entire day, I was about ready to completely give up on the process.
But the bug had bitten.
I decided to give it one more go… just to put things in order, so that if I decided to come back in two more months, it would be there waiting for me, still functional, even if I couldn’t export. And then… it decided to export.
Lo and behold, my game is fully functional – I even tested it on Steam with a real player halfway across the country!