Items disappearing from game?

You are not alone. Here's another thread - https://forums.thesims.com/en_US/discussion/983540/removed-what

So far I'm having this notification with every family I'm loading. But I can't notice anything really missing.

It might be just a technical code thing, not a visual object. I have a feeling the game is running more smoothly (have patch, not SE pack) and I noticed lots of hard drive space was freed up after the patch. Might be something else, but if I removed content equaling 30GB I would have known, so I suspect this patch actually did quite a lot of reprogramming and merging tech processes, which might again result in this "build object missing". I don't know though, just listening to my stomach here ;)

My sims were wearing items from the Holiday free pack and they got removed even tho I still have the clothing in my game...

Thanks for your responses. I first noticed it when I opened a completely empty lot to start building, and it kept happening every time I opened existing lots. I'll check out the other thread as well. Hopefully, it is just a weird glitch that will be resolved.