MISRA 17.6 misreport ?

Hello everyone,

Target C6678, Compiler 7.4.5

Here's a case where I think the compiler reports a false MISRA 17.6 violation.
Can you confirm ? Or is there something that I'm missing ?

typedef struct
{
  int a;
  int b;
}s_ab;

int32* fct(s_ab* alpha)
{
 return &(alpha->b);
}

s_ab* ab;
main
{
 int* adr_b;
 adr_b = fct(ab);
}

Compilation will lead to

(MISRA-C:2004 17.6/R) The address of an object with automatic
          storage shall not be assigned to another object that may persist
          after the first object has ceased to exist ("alpha")
      return &(alpha->b);

Thank you,

Clement