Recoveries without any misplaced objects?

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Hi,

I'm watching a cluster finish a bunch of backfilling, and I noticed that
quite often PGs end up with zero misplaced objects, even though they are
still backfilling.

Right now the cluster is down to 6 backfilling PGs:

  data:
    volumes: 1/1 healthy
    pools:   6 pools, 268 pgs
    objects: 18.79M objects, 29 TiB
    usage:   49 TiB used, 25 TiB / 75 TiB avail
    pgs:     262 active+clean
             6   active+remapped+backfilling

But there are no misplaced objects, and the misplaced column in `ceph pg
dump` is zero for all PGs.

If I do a `ceph pg dump_json`, I can see `num_objects_recovered`
increasing for these PGs... but the misplaced count is still 0.

Is there something else that would cause recoveries/backfills other than
misplaced objects? Or perhaps there is a bug somewhere causing the
misplaced object count to be misreported as 0 sometimes?

# ceph -v
ceph version 17.2.6 (d7ff0d10654d2280e08f1ab989c7cdf3064446a5) quincy
(stable)

- Hector
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