Plastic bottle collapsing:
I've seen the same thing happen with my home-brewed clones of XTOL, and with XTOL itself. I use Dust-Off, which is also difluoroethane. It seems to be absorbed by the dev, creating a partial vacuum, collapsing plastic containers. So far, it has done no harm to my developers. Now I store them in glass bottles, solving the problem of collapsing. But when I unscrew the cap, I hear a "fsss" sound, reminding me about the partial vacuum and making me wonder if I should be using nitrogen instead.

Mark Overton