sims 4 household and house missing after update

@8HA5  Are your households and built houses missing from within saves, or just from your in-game iibrary, or are the saves themselves missing?  If saves are missing some content, are the saves older versions of themselves (like they're in week 10 and you got through week 12 when you last played), or are they fully caught up but just missing some data?

@puzzlezaddict  Missing from my in-game library. The weird thing is that the first household i created is missing but later households are there? Although I can't say the same for my houses as every house i have built is gone. 

The first household and house i built is gone.

The second household i created is there but their house is gone.

The third household i created is there but their house is also gone.

Is the build mode saved differently vs. how households are saved?

@8HA5  Households and builds that are saved to your in-game library have corresponding files in the Tray folder.  Each Library entry has four or five corresponding Tray files, and if even one of those is deleted or removed, the Library entry may disappear.  So if a certain type of file was cleaned out of your Documents directory, it would make sense that any Library item that uses that type of file would also disappear.

The files for saved households will have the extensions .householdbinary, .hhi, .sgi, and .trayitem.  The files for saved lots will end in .bpi, .blueprint, and .trayitem.  There may be more than one .hhi or .bpi file for a given entry.  Although the files have cryptic names, you can sort them easily enough by their modified dates: all the files for a given Library entry will have been saved at exactly the same time.