This quest has been reported as having issues. I started a playthrough some months ago and found it, along with a few other issues, but haven't finished playing through it due to other priorities.
Sim Settlements (the original) is in Legacy mode, which means there is no active development or bug fixing happening anytime soon and the wiki pages for it are also not being maintained.
The hope is that when other projects are completed, Sim Settlements will receive some attention.