If all is good, I would just continue updateing the system.
For some understanding, This error is not specific to CachyOS; it is an upstream issue related to the NVMe drive’s firmware or the host system’s command interpretation.
The error code 0x8004 (According to my experience)(as decoded from 846) corresponds to “Invalid Field in Command” (NVME_SC_INVALID_FIELD), meaning a field in the NVMe command sent to the drive was invalid, reserved, or unsupported.
Please also run a bug-report for the team to look at.
For now please include this:
journalctl -b -1 | grep usb
If the Drive is internal omit | grep usb