I'm pretty sure both heli's are invisible, in stable. I found a Shoe in one of the crash locations (indicating an mi-8 spawn, possibly) and tried looking for a good while in my regular heli route, which i have highly optimized for a good balance between probability, and efficiency. After 5 Runs (for my run i hit 28/56 spots, before switching) not a single one found. Previously the longest that i went without hitting a crash was 3 runs, so this is either an extreme statistical anomaly or they are definitely bugged. I'll try to find another crash with more items on the ground for proof, any help is appreciated.