Getting listing of files in split-volume 7zip archive

I'm using the following command to create a multi-part (each 1G) 7zip archive under Windows 10 (basically a full backup of my documents area):

7z a -r -v1g -bb -y pathtozipsxyzzy.7z .

This successfully creates about 38 1G files for me. However, I wanted to get a listing of all files in the archive afterwards and I'm stumped as to how to do this. The command:

7z l xyzzy.7z.001

retus an error:

7-Zip [64] 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21

Scanning the drive for archives:
1 file, 1073741824 bytes (1024 MiB)

Listing archive: somewherexyzzy.7z.001

--
Path = somewherexyzzy.7z.001
Type = Split
Physical Size = 1073741824
Volumes = 1
Total Physical Size = 1073741824

   Date      Time    Attr         Size   Compressed  Name
------------------- ----- ------------ ------------  ------------------------
                    .....   1073741824   1073741824  xyzzy.7z
------------------- ----- ------------ ------------  ------------------------
                            1073741824   1073741824  1 files
----------
Path = xyzzy.7z
Open ERROR: Can not open the file as [7z] archive

Errors: 1

So the underlying 7z file appears to be visible within the .7z.001 file but it's complaining that it's not a valid archive.

I've also tried it with the -tsplit which removed the error but only then shows the contents as xyzzy.7z without delving in to that file to see its content. In other words, the output is identical to that above but the final line is the one ending 1 files.

Why is this the case? Have I got the command-line parameters wrong? How do I get a file listing out of the split archive?

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