Anyone know what

Type 'string | string[]' is not assignable to type 'string | StringFieldUpdateOperationsInput | undefined'.
  Type 'string[]' is not assignable to type 'string | StringFieldUpdateOperationsInput | undefined'.ts(2322)

Is about? I'm not sure why the type is being defined with string[]

Please show how input value and what method you’re going to use. It looks not prisma bug but your fault about assigning value without additional information. I think you just only specify value have possibility it is both string or string[] to api args.