Maybe, apt-cache depends can shed some light. It seems wine32 depends
on libwine:i386 and the latter breaks wine32.

Here is the output:

$ apt-cache depends libwine:i386
libwine:i386
  Depends: libc6:i386
  Depends: libfontconfig1:i386
  Depends: libfreetype6:i386
  Depends: libncurses5:i386
  Depends: libasound2:i386
 |Depends: libglu1-mesa:i386
  Depends: <libglu1:i386>
    libglu1-mesa:i386
  Depends: liblcms2-2:i386
  Depends: libldap-2.4-2:i386
  Depends: libmpg123-0:i386
  Depends: libopenal1:i386
  Depends: libpcap0.8:i386
  Depends: libpulse0:i386
  Depends: libx11-6:i386
  Depends: libxext6:i386
  Depends: libxml2:i386
 |Depends: ocl-icd-libopencl1:i386
  Depends: <libopencl1:i386>
    ocl-icd-libopencl1:i386
 |Depends: ocl-icd-libopencl1:i386
  Depends: <libopencl-1.1-1:i386>
    ocl-icd-libopencl1:i386
  Depends: zlib1g:i386
  Recommends: libcups2:i386
  Recommends: libdbus-1-3:i386
 |Recommends: libgl1-mesa-glx:i386
  Recommends: libgl1:i386
  Recommends: libgnutls30:i386
  Recommends: libgsm1:i386
  Recommends: libjpeg62-turbo:i386
  Recommends: libodbc1:i386
  Recommends: libosmesa6:i386
  Recommends: libpng16-16:i386
  Recommends: libtiff5:i386
  Recommends: libxcomposite1:i386
  Recommends: libxcursor1:i386
  Recommends: libxi6:i386
  Recommends: libxinerama1:i386
  Recommends: libxrandr2:i386
  Recommends: libxrender1:i386
  Recommends: libxslt1.1:i386
  Recommends: libxxf86vm1:i386
  Recommends: libgl1-mesa-dri:i386
  Recommends: libasound2-plugins:i386
  Recommends: <fonts-liberation:i386>
    fonts-liberation
  Recommends: <fonts-wine:i386>
    fonts-wine
  Suggests: cups-bsd:i386
    cups-bsd
  Suggests: <ttf-mscorefonts-installer:i386>
  Breaks: wine32:i386
edbarx@edbarx-pc3:~$ apt-cache depends wine32
wine32:i386
  Depends: libc6:i386
  Depends: libwine:i386
  Breaks: <wine:i386>
  Breaks: wine32-preloader:i386
  Recommends: <wine:i386>
  Suggests: wine32-preloader:i386