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AR stops working when loading ARScene second time

Hello everyone! I'm developing an app for the museum. There's a scene with an AR camera and some 3d models. When I load this scene from the main menu (non AR scene) for the first time, everything works perfectly - QR codes are detected and models appear as desired . But if I return to the menu and load it again, the models don't show up, as if QR code reader simply didn't work. Please help, I'm stuck with this. I've attached the ARCamera inspector screen.

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