archive failing with ERROR: chown o257-311460-0 failed: No such file or directory

Running a command like

`btrbk --progress -v archive /mnt/usb/mobiledata/snapshots/ /mnt/local/data/archive/`

I always fail to do the complete archive:

```
Archiving subvolumes: /mnt/usb/mobiledata/snapshots/balintop/home/home.*
No common parent subvolume present, creating full backup...
Creating backup: /mnt/local/data/archive/balintop/home/home.20180807T111135+0200
[send/receive] target: /mnt/local/data/archive/balintop/home/home.20180807T111135+0200
[send/receive] source: /mnt/usb/mobiledata/snapshots/balintop/home/home.20180807T111135+0200
in @ 8183 kiB/s, out @ 8183 kiB/s, 26.5 GiB total, buffer 0% full
summary: 26.5 GiByte in 9h 02min 32.6sec - average of 854 kiB/s
[send/receive] checking target metadata: /mnt/local/data/archive/balintop/home/home.20180807T111135+0200
Creating incremental backup...
Creating backup: /mnt/local/data/archive/balintop/home/home.20190727T114502+0200
[send/receive] target: /mnt/local/data/archive/balintop/home/home.20190727T114502+0200
[send/receive] source: /mnt/usb/mobiledata/snapshots/balintop/home/home.20190727T114502+0200
[send/receive] parent: /mnt/usb/mobiledata/snapshots/balintop/home/home.20180807T111135+0200
in @ 0.0 kiB/s, out @ 0.0 kiB/s, 0.0 kiB total, buffer 0% full
summary: 0.0 kiByte in 27.6sec - average of 0.0 kiB/s
WARNING: [send/receive] (send=/mnt/usb/mobiledata/snapshots/balintop/home/home.20190727T114502+0200, receive=/mnt/local/data/archive/balintop/home) At subvol /mnt/usb/mobiledata/snapshots/balintop/home/home.20190727T114502+0200
WARNING: [send/receive] (send=/mnt/usb/mobiledata/snapshots/balintop/home/home.20190727T114502+0200, receive=/mnt/local/data/archive/balintop/home) ERROR: chown o257-311460-0 failed: No such file or directory
WARNING: [send/receive] (send=/mnt/usb/mobiledata/snapshots/balintop/home/home.20190727T114502+0200, receive=/mnt/local/data/archive/balintop/home) At snapshot home.20190727T114502+0200
[send/receive] checking target metadata: /mnt/local/data/archive/balintop/home/home.20190727T114502+0200
ERROR: Failed to send/receive btrfs subvolume: /mnt/usb/mobiledata/snapshots/balintop/home/home.20190727T114502+0200 [/mnt/usb/mobiledata/snapshots/balintop/home/home.20180807T111135+0200] -> /mnt/local/data/archive/balintop/home
[delete] options: commit-after
[delete] target: /mnt/local/data/archive/balintop/home/home.20190727T114502+0200
WARNING: Deleted partially received (garbled) subvolume: /mnt/local/data/archive/balintop/home/home.20190727T114502+0200
ERROR: Error while archiving subvolumes, aborting
Archived 1/5 subvolumes
WARNING: Skipping archiving of "/mnt/usb/mobiledata/snapshots/balintop/home/": At least one target aborted earlier
Completed within: 32587s (Fri Sep 20 23:48:55 2019)
```
I tried again after removing the failed subvolume, but then I get the same error on the next subvolume and so on.

btrfs check and btrfs scrub have found no errors.

This is the latest btrbk from github:

```
# btrbk --version
btrbk command line client, version 0.29.0-dev
```

Kernel is 5.2.15-gentoo and sys-fs/btrfs-progs-5.2.2

Start by reproducing the reported `btrbk --progress -v archive` command with the stated btrbk, kernel, and btrfs-progs versions, then trace the archive send/receive handling for the failing incremental subvolume. Compare the first and subsequent failed subvolumes; done means the archive completes without the `chown ... No such file or directory` error.

Written by the indexing model from the issue text.