1. Your mini-pc has a power problem, that can't power correctly when the above dongle is attached.
2. On recent Proxmox kernels (I believe from 6.8), some people with some USB devices have complete USB bus crashes. This maybe what you are experiencing.
These were actually good points from @gfngfn256, both re Zigbee (1) and USB bus (2) and the kernel could explain if started to happen to you only now, but I understood you installed it only recently, so this was first time you went on to reboot...