[FR] Corrupted Lots/Houses disappear in saves with lots of rental units

This is such an interesting insight!
I wonder if you can recall or test if this change from residential to the 9-byte rental unit data happens after a specific action related to residential rental functionality. Some ideas I'd think could be factors:

• Are those 3 neighbourhoods where you have the corrupted lots neighbourhoods where you have residential rentals in the neighbourhood as well?
• Maybe even the rentals where you potentially used the cheat to have more units per rental?
• Or could it be that you were building rentals, and then loaded into those other (now broken) lots right after that, which could have maybe had some temporary data in memory that affected those next lots as well?
• Or were the other (now broken) normal residentials maybe at some point residential rentals in the past, and changing their lot type back to residential didn't work properly? (For example there is a current issue that changing any lot type to residential via the gallery placing action is bugged, and requires the user to deselect and then reselect the residential lot type for it to correctly assign)

Ultimately, after reading your insights, I now think that the root cause in the issue here related to residential rentals is a different one than the one in the other very similar thread, where all neighbouring houses display as default houses (in all neighbourhoods, no matter where I load into), because in the other thread they revert back to their real lot data as soon as i delete a few lots or apartements again. I don't think they would be able to fix themselves again if their data had been altered like you experienced in your example. This issue here seems even more dangerous, as it alters the data permanently. 😥

• Are those 3 neighbourhoods where you have the corrupted lots neighbourhoods where you have residential rentals in the neighbourhood as well?

Yes and no. In Oasis Springs where I lost nearly every single lot there is only a single Residential Rental (which ironically isn't affected). In Del Sol Valley, I have no Residential Rentals yet all lots there are now empty.

• Maybe even the rentals where you potentially used the cheat to have more units per rental?

I exceeded the max rental units per residental rental lot limit once using the cheat briefly in Windenburg before reverting it. Windenburg hasn't experienced any data loss.

• Or could it be that you were building rentals, and then loaded into those other (now broken) lots right after that, which could have maybe had some temporary data in memory that affected those next lots as well?

This is a good point, I play rotationally so this is very possible. Interestingly enough FutureSim Labs got nuked though and I've never been there with a sim living in a Residential Rental.

• Or were the other (now broken) normal residentials maybe at some point residential rentals in the past, and changing their lot type back to residential didn't work properly? (For example there is a current issue that changing any lot type to residential via the gallery placing action is bugged, and requires the user to deselect and then reselect the residential lot type for it to correctly assign)

I wondered this too, but they weren't previously Residential Rentals. (and in the instance of Oasis Springs, every single lot except the one Residential Rental I have in that world was emptied)

Finally one additional note is that I lost these lots in August (I was able to confirm by loading earlier saves). So it pre-dates me switching to Memory Boost.