At my house we routinely scorch parchment paper (the edges away from food) and use it for all sorts of purposes. It
should be perfectly safe because the coating is just silicone. However, white parchment paper has some amount of dioxin in it (I'm not sure how much), which is bad stuff; possibly also fluorine. I've also heard that some parchment may add plastics for extra non-stick, exposing you to PFAs and the like.
Probably a good idea to stick with the hippie-looking brands / made in Western countries like If You Care, which use unbleached paper and silicone and presumably don't douse the paper in other chemicals.