Unable to purchase books and attend one-time skill classes (Steam, no mods)

Hi everyone,

i'm experiencing two issues that seem to be related, and I'm hoping someone might know what's causing them.

Issue 1 – Purchase Books. When I choose Purchase Books from a bookshelf or a computer, the book catalog is almost empty.

For example:

only a few categories are available (Show All, Skill, Homework),

under Skill Books I only have Handiness Vol. 1,

all other skill books are missing. Sometimes the Purchase Books interaction even disappears completely after restarting the game.

Issue 2 – One-Time Skill Classes: when I use my Sim's phone and select:

Business → Attend One-Time Skill Class (250 Simoleons)

my Sim simply takes out the phone, looks at it for a second, and then cancels the interaction.

Nothing happens: no loading screen, no travel, no notification, no Simoleons are charged, the class never starts. My Sims can still gain skills normally by reading books, cooking, painting, etc. Only the One-Time Skill Classes are broken.

What I've already tried

I play The Sims 4 on Steam (Windows PC).

I don't use any mods or custom content.

I verified the game files through Steam (everything is OK).

I deleted localthumbcache.package.

I renamed my Documents\Electronic Arts\The Sims 4 folder so the game created a completely fresh user folder.

I tested with a brand new save.

I created a completely new Sim.

I tested in a different house and different world.

The issues still occur in the fresh save.

Other phone services (repair service, maid, etc.) work normally.

Normal skill progression works correctly.

My game version is 1.126.73.1030 DX11.

Since the same problems occur even with a completely fresh user folder and a new save, I don't think my save files are corrupted.

Has anyone experienced these two issues or found a solution? Any help would be greatly appreciated.

Thank you!