Sierra: disable cap lock configuration not saved

This is clearly a bug; however, all of the other reports have been given a vanilla "go to system preferences > keyboard > ..." answer or blamed on 3rd party software.

To substantiate the "bug" claim and refute any outside influence, today I:

1. Booted into the macOS Sierra installer
2. Erased the SSD
3. Reinstalled macOS Sierra
4. Completed the basic setup steps to get to the desktop
5. Applied available OS updates through the app store
6. Rebooted
7. Used System Preferences > Keyboard > Modifier Keys to set the caps lock key to "No Action"
8. Exited system preferences and verified the caps lock key was disabled
9. Rebooted
10. Tapped the caps lock key => light came on
11. Used System Preferences > Keyboard > Modifier Keys to verify the caps lock key was again mapped to "Caps Lock"
12. Rebooted into safe mode
13. Repeated steps 7 through 11 (same result)
14. Used System Preferences > Keyboard > Modifier Keys to set the caps lock key to "Escape"
15. Rebooted
16. Used System Preferences > Keyboard > Modifier Keys to verify the caps lock key was still mapped to "Escape"
17. Rebooted
18. Repeated steps 7 through 11 (same result)

The dialog is there, and this is obviously an intended feature. It doesn't work as intended, i.e. the changes do not persist through a reboot if the "No Action" option is selected, and is therefore a bug.

Now I have to go through all the other system settings I automate through my normal initial configuration script to see if any of those are getting reset to defaults without my knowledge. #Bunk

Happens in 10.2.3 as well, on almost-new TouchBar rMBP 15".