User blog comment:Trainsparency/2019 Spook and Sinister Hunting Thread/@comment-35996958-20191009124457/@comment-36600770-20191009140449

It wasn't a glitch actually, it was just that spook spawning became an automatic data storage update after that year, implying that Josh would have manually triggered spook spawning at that time, which, he could have been a bit late to triggering them off. They're still holding on to hope that we can find some after October though.