I'm sorry but I'm not sure what you mean by holiday 'box'? Like the box on the top left of the screen which tells you which goals you have completed? In that case, I'm really not sure what would cause that. Occasionally I get a last exception note (see attachment, not sure if that would be useful) that says something about a 'holiday drama node'. I don't understand any of that, of course, but I figured it might have something to do with this bug.
I only use cc (only clothes and hairstyle) and I haven't tried to do this again while disabling cc, because I don't feel like going through all this again (the disappearing holiday, nobody being able to attend work/class, disabling seasons (which I tried now, and which worked for me), turning it back 'on' and seeing that three out of three sims kids DID lose their entire scouting career (and with that their progress), while this was not the played household during the short period in which I disabled seasons).
So it would be good to know that if you disable and after that enable seasons, only the household you play with during disabling loses all build/buy/cas items (previously played households won't), but these other (previously) played households WILL lose their scouting career and progress, even if they're not played with when you have seasons disabled.