So resistable =0 has never worked very well (for exapmle, it never worked on knock effects), but it seems like something broke recently because some theoretically unresistable dots (like Socialist Healthcare and some mod dots -- I know OneMoreNameless has encountered the issue with ASCII Invasion) are either being resisted with no popup or are simply failing to trigger at all for some reason. But being resisted seems to make moat sense because at least with Socialist Healthcare, it seems to work most of the time.
The only dot I absolutely know from core material is Socialist Healthcare, and the only spell effect I absolutely know isn't affected is knock, but I suspect most spell effects don't work with it. I'll see if I can get a more coherent list together tomorrow or Friday.