IP stops returning to arp-scan when sshed into

When I do a scan of my local network via the command arp-scan --localnet, I find that the IP of the machine which has Ubuntu-MATE on it shows up in the list of IPs brought back by arp-scan. But when I ssh to that machine and then issue the command arp-scan --localnet from the machine that I had sshed from, I find that the IP address of the computer with Ubuntu-MATE on it is absent from the list. I expect the IP address with the machine with Ubuntu-MATE to show up. I tested this with other machines and operating systems and those still returned an IP address when issued arp-scan --localnet. The Ubuntu-MATE machine was the only one which didn't.

I posted a bug report here and here:
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1711465
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1711465
These links lead to more thorough data if applicable.

Description: Ubuntu Artful Aardvark (development branch)
Release: 17.10

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: arp-scan 1.9-1
ProcVersionSignature: Ubuntu 4.11.0-13.19-generic 4.11.12
Uname: Linux 4.11.0-13-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.6-0ubuntu5
Architecture: amd64
Date: Fri Aug 18 20:59:50 2017
InstallationDate: Installed on 2017-01-07 (223 days ago)
InstallationMedia: Ubuntu-MATE 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: arp-scan
UpgradeStatus: Upgraded to artful on 2017-08-11 (7 days ago)