@Jazzy92211 

Can I please make an example/suggestion? Since I'm not sure how many packs you own, I am wondering if you would be able try something. I have a lot that I made using only basegame items (no packs). It is available in the gallery under my name and is named \"BaseGame $18.5K Starter\". I just placed this lot in my game by going to the World Map View, choosing the lot from my library, and placing it on a 30x20 lot in Newcrest. While the game is placing the lot you should see this screen:

Once the lot completed the placement, I got this message both in the World Map View...

...and when I enter the lot I also see the message:

Is this message different or the same from the message you see in your game? If you download this lot from the gallery and place it in your game, do you see a different message? The message does not remain long, but if you could grab a screenshot of the message you see in your game if it's different and share it here so we can read it, that would be super helpful. There is some information on taking screenshots if you haven't done this on this page.

@Jazzy92211 Yes, that (below) is the normal notice you see if the builder of the lot had MOO active while placing even one item on the lot. It's actually a hugely helpful update to the game for builders, and for those that like to download lots or rooms from the gallery to be placed in their own game. It serves several purposes:

• It lets you know that the builder of the lot had MOO active while placing even one item on the lot.
• It gives you a heads-up that since this was the case, it's possible, if the builder did not sufficiently play test the lot to make sure all items alt-placed or MOO-placed did not interfere with Sims accessing that item or other items in the area, there could be issues in gameplay. 
• This does not mean that MOO is active on your lot after placing the item. MOO will only be active on the lot if you activate it separately.
• The majority of that notice is explaining how to use MOO if you want to do so in your game, which has nothing to do with the download you just made. It just explains what the cheat is and how to activate it or deactivate it.
• Therefore, normally the only reason items should be removed when the lot is placed, whether or not the builder used MOO while making the home, should be if the builder used custom content you don't have or packs/content that you don't own. For instance, if I stuck a yoga mat on the living room floor in the home and you don't have the 'Spa Day' pack, the yoga mat will be removed when the lot is placed in your game. If you are seeing an additional notice that says items have been removed, it will be for a reason like this.

The notice doesn't say that items may be missing, it says that they may not be accessible (for the reasons I just stated above). See a larger/legible image of the notice below:

@Jazzy92211 If you have all packs I can't think of items that should be missing, unless there were Custom Content items removed or Debug items that didn't stick since they are not retained (if they are part of an action like a specific cooking action or something along that line).

Tell you what... I also have all packs. Would you be willing to place a recent lot I made? It uses many packs, debug items, and MOO, but it has no custom content or debug items that would be removed because they're part of a game action only. Then could you see if the message you get is any different than the one I posted earlier today? 
Gallery User ID: SheriGR
Gallery Lot: \"Michigan Farmhouse\"

Browser Gallery Link (or just search in the in-game gallery for the correct name and user ID): https://www.ea.com/games/the-sims/the-sims-4/pc/gallery/EE478920491111EC839AEA3E90C3E6E0

yup. here's the screenshot of my game. 

@Jazzy92211 Unfortunately the image/screenshot is showing as broken/not showing for me. ☹️

Yeah I have the same problem too where objects arn't showing up. But in may case its all the walls for some builds. Every item from photos on the gallery seems to be there, except the walls, which don't even seem to be custom content or debug. Would you have any advice?

@AimeeRW Can you include a screenshot(s)? Did you double-check that the walls that you want to be up are up in settings? Do you have CC &/or or Mods? Is this happening on only one lot or in all lots? Is the issue there if you start a fresh gamesave?