[NEEDS INPUT] [DU] [ROM] Textbooks show up under study magic tomes on bookcases

Product: The Sims 4
Platform:PC
Which language are you playing the game in? English
How often does the bug occur? Every time (100%)
What is your current game version number? 1.60.54.1020
What expansions, game packs, and stuff packs do you have installed? All up to and including DU.
Steps: How can we find the bug ourselves? Have a spellcaster. Buy or find magic tomes in the Realm. Buy DU textbooks from a kiosk in Brichester. Put all the tomes and books in a bookcase. Have the spellcaster click on Study Magic Tomes. The listing will include the DU textbooks.
What happens when the bug occurs? Nothing really. The textbooks can't be accessed through the option but they are listed in a greyed out manner just like the tomes you have already read or have the spells for.
What do you expect to see? When I click that option, I expect to see the listing contain just the Magic Tomes just as it did before DU was installed.
Have you installed any customization with the game, e.g. Custom Content or Mods? Yes
Did this issue appear after a specific patch or change you made to your system? Yes
Please describe the patch or change you made. Installing DU

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This is not really a bug.  It has no effect on gameplay other than making search list for the magic tomes longer.  You can't choose the textbooks to read through the Study Magic Tomes option.  They work just all the other non magic tome books otherwise. 

I have checked this in a vanilla game with no mods or cc.  Same thing happens.