[FIXED] [ROM] Spellcaster forget spell when saved in the library

I've come to report an update on this issue: I did a controlled experiment by seeing when if someone were to send me a caster Sim through the Gallery with a learned spell in the spellbook, will it keep the spell? So I dl'ed this Sim into my clean, fully updated game on a brand new save hoping that the spell would at least appear. I first dl'ed the Sim to my library and then dropped her directly into the save from the library, and to no avail she had no spells learned. I then tried dropping her directly from my library to my CAS, saving that, then dropping her caster household into the world, and it also failed to display any learned spells.

Finally, I tried dropping her just directly from the Gallery to the world, and what do you know? Didn't work either. I've exhausted all other possible options I could think about and surmised that it's not just the library that has this issue, but the Gallery too. I've lost any will to play with RoM now until this is addressed as an actual problem that needs solving.