Looks like the statement to print the “Pair Coeffs” header is missing from the restart2data tool.
P.S. I’ve also had some strange behavior trying to unpack the latest archive. Gunzip gives the following error:
$ gunzip lammps-upgrade.tar.gz
gunzip: lammps-upgrade.tar.gz: not in gzip format
GNOME fileroller works fine, so this may be on my end, but I can’t reproduce it with any other files.