Not entirely sure if this has been mentioned already, if it is so be it.
So there's an issue with .gob massscale or maybe two. I wasn't able to test the second one yet. Anyway, the first issue is that .gob massscale doesn't do what it should, instead it does exactly the same as .gob massreplace. The second issue is that before the update, after using the command and leaving the phase, relogging or a crash/restart all objects affected would reset.
Anyway I thought I'd leave this here while I took a break from manually rescaling objects.