The 15 suffers similar issues as the 13 inch 2019 spectre and other whiskey lake hp laptops - many USB-C devices, including perfectly compliant chargers, cause it to hard lock (firmware/bios bug, not blue screen). In my case, compliant devices (such as phones), EGPU docks, caused the hard lock.
You can test this by bringing an official apple charger and cable to Best Buy. When I bought mine, I was sure it was a hardware issue until I demonstrated it on every floor model laptop by plugging in an official apple charger and my pixel 3, crashing each one instantly.
HP said that they would release a firmware update that fixed this but I don't know if it's out yet. I returned my spectre and bought a razer - this kind of bug is 100% inexcusable.
TLDR: If you purchase one of these, make sure to do it from a place that doesn't do restocking fees, apply the most recent BIOS update, and then test the laptop with multiple USB-C devices (and cables). A shame - I really liked the hardware.