After commenting the corresponding lines /lib/udev/hwdb.d/60-keyboard.hwdb out, 
issuing
# systemd-hwdb update
and rebooting, the middle slider up/down keys stopped producing any effect 
completely at least in Firefox (i.e., it got worse). The "Failed to call ..." 
error is gone from the output of journalctl -b, though.  Running evtest and 
checking event8 produces absolutely no effect for the slider keys. Running 
evtest and checking event9 produces the following effect for the slider keys up 
(+) followed by down (-):
Event: time 1597336850.366186, type 4 (EV_MSC), code 4 (MSC_SCAN), value c022d
Event: time 1597336850.366186, type 1 (EV_KEY), code 418 (KEY_ZOOMIN), value 1
Event: time 1597336850.366186, -------------- SYN_REPORT ------------
Event: time 1597336850.510185, type 4 (EV_MSC), code 4 (MSC_SCAN), value c022d
Event: time 1597336850.510185, type 1 (EV_KEY), code 418 (KEY_ZOOMIN), value 0
Event: time 1597336850.510185, -------------- SYN_REPORT ------------
Event: time 1597336851.454182, type 4 (EV_MSC), code 4 (MSC_SCAN), value c022e
Event: time 1597336851.454182, type 1 (EV_KEY), code 419 (KEY_ZOOMOUT), value 1
Event: time 1597336851.454182, -------------- SYN_REPORT ------------
Event: time 1597336851.526184, type 4 (EV_MSC), code 4 (MSC_SCAN), value c022e
Event: time 1597336851.526184, type 1 (EV_KEY), code 419 (KEY_ZOOMOUT), value 0
Event: time 1597336851.526184, -------------- SYN_REPORT ------------

I'll revert to the prior default setting of
/lib/udev/hwdb.d/60-keyboard.hwdb in the meantime.

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https://bugs.launchpad.net/bugs/1890186

Title:
  Failed to call EVIOCSKEYCODE with scan code 0xc022d, and key code 103:
  Invalid argument

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