Kia - gas/exhaust smell in cabin

My 2023 Kia Carnival has been smelling like gas in the cabin. I brought it to Kia, and they acknowledged that they smelled it too at drop off. They said they checked the fuel lines and didn't see any leaks. They said my cabin filter was dirty and recommended a ventilation refresher service. Ok, fine. Did that. Got it back. It still smells like gas inside the cabin - possibly worse. Every time I drive my car, I get a raging headache and nauseous (assuming from the headache). Any idea what this could be?

I am bringing it back to Kia, but it's driving me insane.