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This is really for awareness, I've used polymer clay since I was young so I am pretty comfortable with the stuff.

What I didn't know until yesterday is uncured polymer clay can react adversely with some types of plastics. I usually store the clay in separate containers, but after my last use there were a few small pieces I threw into one of my bits box's. When I picked some out yesterday I notices some sides has some sort of sticky liquid, at first I thought it was a reaction to the paint, but on further inspection I realized it was the plastic which had melted, which was later confirmed checking on the internet’s.

It’s been in there for over a month, and it didn’t turn entire sections into gloopy masses, just surface areas so it might take a while to set off a reaction. So yeah don’t leave any plastic miniatures near uncooked clay.

I've noticed this myself. I sculpted a few heads on plastic headed needles. I let them stand around until i had enough to cure them. Then i noticed the sticky rubbery mass the needle heads had turned into.
To be on the save side i threw them away and redid them with GS.

Plastic wrap/cling film does the same thing. Went to unwrap a block my fiancee had enclosed in the stuff, for lack of the original packaging, and found that the film had gone limp and slimy. Obviously, some plastics are immune (small bricks come in cellophane, after all), but apparently not polystyrene and whatever plastic is used for the cling film.

Polyethylene is used for clingfilm.