Unable to xfsdump/xfsrestore filesystem

[David Brown <davidb@davidb.org>]

I am using xfsdump with multiple levels to backup my main system
(Fedora f31, xfs root and home on LVM).  Kernel is
5.5.6-201.fc31.x86_64.

When doing a test restore of my backup, when I reach my level 2
backup, I get the following warnings:

    xfsrestore: directory post-processing
    xfsrestore: WARNING: unable to rename dir orphanage/422178422.2232121414 to dir <<path>>/b-cloud: No such file or directory

In addition, I get hundreds of these.  They seem to all be related to
that same directory.

    xfsrestore: restoring non-directory files
    xfsrestore: WARNING: open of orphanage/422178422.2232121414/modules/atmel/cmake_install.cmake failed: No such file or directory: discarding ino 2833282
    xfsrestore: WARNING: open of orphanage/422178422.2232121414/modules/atmel/asf/common/cmake_install.cmake failed: No such file or directory: discarding ino 2833283

When I verify the restore (using https://github.com/d3zd3z/rsure), I
indeed find that <<path>>/b-cloud is missing, but another directory
next to it is still present that should be removed.

Restores of subsequent print similar messages (and don't restore the
directory), until one of them dies with this:

    xfsrestore: WARNING: unable to rename dir orphanage/422178422.2232121414 to dir <<path>>/b-cloud: No such file or directory
    xfsrestore: node.c:539: node_map: Assertion `nh != NH_NULL' failed.

Any ideas on how to debug this?

Thanks,
David