gmtp can't connect to phone while gvfs-gphoto2-volume-monitor running

[Dan Kegel]

My Nokia 6.1 phone is properly autodetected, and I can fetch files from it fine via
the default ubuntu gui (using gvfs etc).

However, running gmtp fails. To diagnose this I tried running mtp-detect.
This fails with

dank@thinky:~$ mtp-detect
libmtp version: 1.1.16

Listing raw device(s)
Device 0 (VID=2e04 and PID=c025) is a Nokia 6.
   Found 1 device(s):
   Nokia: 6 (2e04:c025) @ bus 3, dev 35
Attempting to connect device(s)
error returned by libusb_claim_interface() = -6LIBMTP PANIC: Unable to initialize device
Unable to open raw device 0
OK.

As described in https://bugs.launchpad.net/ubuntu/+source/gvfs/+bug/1314556/comments/40
killing gvfs-gphoto2-volume-monitor let mtd-detect and gmtd work properly.

Is the clash expected?

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: gvfs-backends 1.40.1-1
ProcVersionSignature: Ubuntu 5.0.0-13.14-generic 5.0.6
Uname: Linux 5.0.0-13-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.10-0ubuntu27
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sun May 12 15:21:27 2019
InstallationDate: Installed on 2017-04-29 (743 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gvfs
UpgradeStatus: Upgraded to disco on 2019-05-12 (0 days ago)