Yes!! I'm having this exact issue! I got the newsletter, read it once, but it disappeared from my inventory and my tasks went blank. I tried rolling back my saves, but the event stays at the same progression, even when going back to a place in my save before I began the event. I've been trying to fix it for two hours, thought I was going crazy, lol.
I did try switching households but didn't see a newsletter there, either. But I see there are some other suggestions in the thread, so I'll try these. Of course, this is the one event I really, really want to play, and it bugs out on me. SO. Frustrating. 😤