[cc65] Structure assignment

Is there an issue with structure assignment or am I doing something really dumb? The following program produces the output

22 23 24
0 0 0

rather than

22 23 24
22 23 24 as I would have expected. I am using 2.12.0 on an Atari platform.

#include <stdio.h>
#include <stdlib.h>

struct point_struct {
  unsigned char x;
  unsigned char y;
};

struct rectangle_struct
{
  struct point_struct p1;
  struct point_struct p2;
  unsigned char width;
  unsigned char height;
};

struct rectangle_struct r1;
struct rectangle_struct r2;

void copy_rect( struct rectangle_struct *r )
{
  r2=*r;
}

void main(void )
{
  r1.p1.x=22;
  r1.p2.x=23;
  r1.height=24;
  copy_rect(&r1);
  printf("%i %i %i\n",r1.p1.x,r1.p2.x,r1.height);
  printf("%i %i %i\n",r2.p1.x,r2.p2.x,r2.height);
}
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