Finishing Joyless opened entertainer job with NaN% morale bonus

[Wraith-of-Seth]

I currently play (v.1.4.1a) antids in a magic universe for the joyless challenge. I managed it, but while entertainers were activated again, they now show up as providing a NaN% morale bonus:

I've also attached my savegame, in case this helps identifying what went wrong.
evolve-2025-01-07-13-24-buggy-entertainers-v1.4.1a.txt

PS: It seems to have to do with technologies, maybe the job should not have been visible at all without research. After researching more entertainment tech, it worked again.