Things that get overlooked when you dont have proper inspections

We discovered this issue in a 70k sqft 2 story office building in Rocklin, Ca
This was original install from 2008 and every annual inspection until 2021 did not report this. The smoke detector we had to add in 2021 because they were never installed per plan; who does this? I could say names but I won't they were the installing and inspecting company from 2008-2020. It pays to contract someone who cares about what they do for a living