Did -install-service change?
I have ALWAYS used
-install-service -instance 15
Note that that is "15" & NOT "1.5".
Yet... with 1315, if I run the above, I end up with a "1.5a" instance (& that is with an 'a', even though not specified) & not a "15"?
(As it happens, I ran a separate instance, at least I think I did, without specifying "any" instance, & when I went to "kill" it, remove the service, seeing "1.5a" which I know is default, I killed that, which then rendered updates in my "regular" profile, mute.)
(I will note, that I do have various named instances running, 5 at present, using varying versions of Everything.
Though I've not run into this before now.)