I managed to reproduce the same behavior on one of my Debian virtual machines with tzdata 2016e-0+deb8u1 and zdump (Debian GLIBC 2.19-18+deb8u4) 2.19

I'm not presently seeing it in my personal development copy of the Git repository, running in Cygwin, but although I remade zdump, I'm not sure offhand if it's perhaps parsing an older tz binary.