I reported this issue a while ago but I still have the same issue.
If I disable FTP service and reboot then I get a red light on the running indicator for the FTP service.
If I enable FTP and restart then I get green light on running indicator but enabled is grey.
So I think there might be a bug in the code/logic that enables/disables the FTP service.
I'm happy to investigate but I need some help to get started
screen shot of status after reboot with FTP service disabled/off