In 1.03 the house inventory worked fine. In the 1.04 exp version, there seems to still be an inventory for static buildings but it does not properly show up in the GUI.
Only attachments are shown, the cargo gui element is missing

The building has the class=house in the p3d and the following cargo config

class Cargo
{
    itemsCargoSize[] = { 10, 3 };
    allowOwnedCargoManipulation = 1;
    openable = 1; //also tried 0
};

Also it uses

	override bool IsInventoryVisible()
	{
		return true;
	}

	override bool CanUseConstruction()
	{
		return true;
	}

	override bool CanDisplayCargo()
	{
		return true;
	}

to make the inventory visible and fix the check in the vicinity item manager. The desired object is returned correctly as part of the showable_items array in the VicinityContainer and as far as I debugged - it is added with an AttachmentCategoriesContainer because I also have a GUIInventoryAttachmentsProps present in the config.

I could not see any difference in script or config compared to how other objects setup their inventory, cars for example, so I assume something broke in a different place.

Please check what is going on and or tell us what we need to do in order to have working building/house inventories again.