Symptom
When to 3850-24XS switches are in standalone the output of show switch stack-ports summary indicate that no stackwise-480 is connected.
After converting them to stackwise virtual output shows that there is a stackwise-480 cable between them, when there is none.
Conditions
3850-24XS in stackwise virtual running 16.8.1a.
At this point it is the only software release which support stackwise-virtual on 3850-24XS switches.
Further Problem Description
Please refer to tac-repro