Turns out some poor fellow had an issue with mental health, not sure the specifics - but every day like clockwork he'd fill in one of our 20 page forms, submit his identification and apply for something. We had records for this same fellow going back 20 years when he first attempted to get involved with our organisation. The team responsible for actioning those forms are familiar with him, and have manually built in steps to ignore his submissions from reporting and extraction..
Whilst debugging this issue I found notes from each new manager that came and went over the years who encountered this fellow. Each had different opinions on what should be done, thankfully humanity reigned and nobody wanting to seek legal measures won.
When debugging this, I noticed the submissions stopped 4 months prior. I looked him up online, lo-and-behold an obituary.