SD38.93: CHECKPOINT counter rotate BY touch 1/4 from a 2x5

[GuySteele]

This succeeds:

Sd 39.83 : db39.83 : ui1.13tty     C2

 1:   HEADS pair off
 2:   touch 1/4
 3:   1/2 truck

  .    3G^   4BV   2G^   3BV

 1B^   4GV   2B^   1GV    .

 4:   CHECKPOINT counter rotate BY circulate

       2G<   3G>

    1B^   2B^    .

     .    4BV   3BV

       1G<   4G>

but this somewhat similar example fails:

Sd 39.83 : db39.83 : ui1.13tty     C2

 1:   HEADS pair off
 2:   touch 1/4
 3:   head girls U-turn back

 3GV   4BV   2G^   3BV

 1B^   4GV   2B^   1G^

 4:   1/2 truck

 3GV    .    4BV   2G^   3BV

 1B^   4GV   2B^    .    1G^

Can't do this call:
CHECKPOINT counter rotate BY circulate
Can't find checkpoint people in this formation.

I was expecting:

       2G<      

    1B^   2B^   1G^

    3GV   4BV   3BV

             4G>