“A good electric chair” is how Jane Schoenbrun describes their first Cannes Film Festival premiere. “I really felt like my body was in a state of convulsion,” says Schoenbrun. The day after the premiere of “Teenage Sex and Death at Camp Miasma,” a bold, bloody queer slasher film starring Hannah Einbinder and Gillian Anderson , Schoenbrun and their co-stars were still buzzing from the ecstatic response. The movie, one of the most prominent American films in Cannes this year, gave the festival a gonzo jolt. For Schoenbrun, the leading trans filmmaker of their generation, the film extends their intensely personal exploration of gender and the movies that defined their youth. But their first two films — 2024’s “I Saw the TV Glow” and 2021’s “We’re All Going to the World’s Fair” — were the raw, burning products of Schoenbrun’s transition. “Teenage Sex and Death at Camp Miasma,” drawn from Schoenbrun’s happy, exploratory post-transition life, isn’t that. It’s about desire and sex.…