I have typed in the cheat correctly multiple times, rebooted my game multiple times, and this is still a persistent issue.
When I open my cheats (Ctrl+Shift+C, type testingcheats true, then bb.showhiddenobjects and bb.showliveeditobjects with no additional spaces) I am able to access some debug objects, but not the full menu, it is significantly less than before. I am missing landscaping, shells of buildings, smaller objects, I'm really only seeing things like collectables and crafted items from the base game and other packs. I'm doing the exact same thing I've always done and I use to be able to access the full menu, but not anymore. It seemed to start happening after a more recent update, I don't try to access debug too often so I couldn't say exactly when, but it's been happening for awhile now and I really don't think it's anything I'm doing wrong. (I also noticed there's now a debug category you can filter by in build mode and I have the largest menu when I select that verses just searching "debug" in the search bar, because the selection/number of debug items also varies for me.)
If it is something I'm not doing please let me know, but I couldn't find any information about it online, so I'm assuming it has to be a bug and maybe others are seeing it too? (I couldn't find any recent reports on here though, only ones from a few years ago.)