Huh, I’ll be, it is new, or at least, not in 1.2.1.5.
For some reason I had thought this was how it had worked since 1.2.
This behavior is indeed new, @Zantai . 
I’d assume it is a bug as the quoted thread implies. On the assumption that it is a bug to be fixed, I’m ambivalent. Sunder was always something to be avoided. I don’t particularly care if people get omegauber-punished for not doing so.