upower forgets UPS when nut-server starts

[Dave Ulrick <d-ulrick@xxxxxxxxxxx>]

I'm running Fedora 34 on three Linux systems that are connected to USB 
UPSes. I have installed NUT (Network UPS Tools) on all three.

If I connect with nut-server stopped, upower detects the UPS:

# upower -d
Device: 
/org/freedesktop/UPower/devices/line_power_tps6598x_source_psy_i2c_INT3515o02_tps6598xx0
  native-path: tps6598x-source-psy-i2c-INT3515:02-tps6598x.0
  power supply:         yes
  updated:              Wed 30 Mar 2022 08:14:08 AM CDT (87 seconds ago)
  has history:          no
  has statistics:       no
  line-power
    warning-level:       none
    online:              no
    icon-name:          'ac-adapter-symbolic'

Device: /org/freedesktop/UPower/devices/ups_hiddev0
  native-path: 
/sys/devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.2/1-2.2:1.0/usbmisc/hiddev0
  vendor:               American Power Conversion
  model:                Back-UPS RS 1500G
  serial:               4Q1805P11448
  power supply:         yes
  updated:              Wed 30 Mar 2022 08:15:31 AM CDT (4 seconds ago)
  has history:          yes
  has statistics:       yes
  ups
    present:             yes
    state:               fully-charged
    warning-level:       none
    time to empty:       1.6 hours
    percentage:          100%
    icon-name:          'battery-full-charged-symbolic'
  History (charge):
    1648646131  100.000 fully-charged
    1648646101  0.000   unknown
  History (rate):
    1648646101  0.000   unknown

Device: /org/freedesktop/UPower/devices/DisplayDevice
  power supply:         yes
  updated:              Wed 30 Mar 2022 08:15:31 AM CDT (4 seconds ago)
  has history:          no
  has statistics:       no
  ups
    present:             yes
    state:               fully-charged
    warning-level:       none
    time to empty:       1.6 hours
    percentage:          100%
    icon-name:          'battery-full-charged-symbolic'

Daemon:
  daemon-version:  0.99.13
  on-battery:      no
  lid-is-closed:   no
  lid-is-present:  no
  critical-action: PowerOff

Then, if I start 'nut-server' (systemctl start nut-server), the UPS 
disappears from upower.

# upower -d
Device: 
/org/freedesktop/UPower/devices/line_power_tps6598x_source_psy_i2c_INT3515o02_tps6598xx0
  native-path: tps6598x-source-psy-i2c-INT3515:02-tps6598x.0
  power supply:         yes
  updated:              Wed 30 Mar 2022 08:14:08 AM CDT (109 seconds ago)
  has history:          no
  has statistics:       no
  line-power
    warning-level:       none
    online:              no
    icon-name:          'ac-adapter-symbolic'

Device: /org/freedesktop/UPower/devices/DisplayDevice
  power supply:         yes
  updated:              Wed 30 Mar 2022 08:15:45 AM CDT (12 seconds ago)
  has history:          no
  has statistics:       no
  unknown
    warning-level:       none
    percentage:          0%
    icon-name:          'battery-missing-symbolic'

Daemon:
  daemon-version:  0.99.13
  on-battery:      no
  lid-is-closed:   no
  lid-is-present:  no
  critical-action: PowerOff

The visible effect of this issue is that the XFCE4 Power Manager applet 
doesn't show the status of the UPS.

Once upower has forgotten the UPS, I can make it remember it by running:

# systemctl stop nut-server
# systemctl restart upower

but it will forget it again if I run:

# systemctl start nut-server

Is this a feature or a bug?

Thanks,
Dave
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