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SCN mismatch after RMAN duplicate

Using RMAN do create a physical standby database, I issued the command

duplicate target database for standby dorecover;

The alert log reports, e.g.,

The input backup piece /rman/D1-t952516342-s13787-p1.bak is in compressed format.Wed Aug 23 06:52:23 EDT 2017Full restore complete of datafile 1 /home/db/system01.dbf.  Elapsed time: 0:00:21   checkpoint is 6028004172  last deallocation scn is 6027959222

There are similar entries for the other data files, all with slightly different checkpoints between 6027956543 and 6028004183.  So far so good; restore was successful.

But recovery fails, asking for archivelog reaching weeks before the RMAN backup that was used for the restore.  And when I check v$datafile,

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