@Dzonna I agree. I've been playing since the Sims 1, too, and Sims 4 is the most annoying, both in constant glitches that ruin playability, and the lack of features.
FYI, this items removed issue isn't exclusive to PCs. I have a Macbook Pro and the game is doing the same thing. And no, I do not have and never have had any mods or CC.
I'm mainly only noticing with community lots. And I AM noticing things missing!
For example, my Sim went to visit Waterside Warble -- a lot that I've modified with EA-made objects, but that had everything required for a karaoke bar lot -- and I noticed that most of the seating was missing! Bar stools, couches, armchairs, etc. A few tables were missing too, and some decor, but I'm less certain on that...
Actually, while my sim was there, the missing seating was the most noticable, but the whole place looked pretty empty... BUT, when I left the lot, it had an exclamation mark above it denoting the missing stuff, so that's how I was able to tell that some chairs and dining tables were missing too.
So far, I've had this happen to three of my community lots that I've modified with EA-made stuff. It's really frustrating when you have all of the packs but it tells you things are missing AND removes them from lots that you've spent time revamping! Even if they fix this issue, that still means I'm going to need to go back into all of those lots and fix them again!
I hope this get this patched ASAP!