Player starting characters have a 50% chance to start with trait: Hard worker. It seems that this is actually 100% chance. You can see the scenario here http://steamcommunity.com/sharedfiles/filedetails/?id=736126865.
Sorry, your link leads to a page which is telling me you have either moved or deleted the scenario :-\
I think I can corroborate this, though. While making a scenario earlier I had a trait set to 100% but it only showed up maybe 50-75% of the time. o.o Definitely wasnt 100...
This is a known bug.
This bug should have been fixed for A15
https://ludeon.com/forums/index.php?topic=21729.msg251188#msg251188
Is anyone still experiencing this issue in A15? And if so can they please post a scenario file showcasing this issue, or reproduction steps. Thank you.
Edit - 10th September -
A user responded to my post with confirmation that this bug, or more likely a variant of it, was still present in A15c (0.15.1284). So I split that post to create a new bug thread, and will close this thread as a result. Here is a link to the new thread.
https://ludeon.com/forums/index.php?topic=25888.0