Trouble with <on>begin-and-end</on>

[Penguin-Guru]

I could be misunderstanding how this is supposed to work but it seems like the TOUCHEGG_GESTURE_ON variable is not being set. My script is executed a few times but when I try to log output including the variable's value, the value seems to be empty. Is this expected? I have tried this without specifying repeat and with specifying repeat as both true and false. My operating system is Linux and I compiled Touchegg without SystemD.

<gesture type="SWIPE" fingers="2" direction="UP">
    <action type="RUN_COMMAND">
        <repeat>false</repeat>
        <on>begin-and-end</on>
        <command>toggle-drag-window</command>
    </action>
</gesture>

#!/bin/bash

if [ -z ${TOUCHEGG_GESTURE_ON+x} ]; then
    is_set=unset
else
    is_set=set
fi
logger -p daemon.debug "TOUCHEGG_GESTURE_ON ($is_set) = $TOUCHEGG_GESTURE_ON"

if [[ "$TOUCHEGG_GESTURE_ON" == 'begin' ]]; then
    xdotool keyup super keydown super
elif [[ -z "$TOUCHEGG_GESTURE_ON" || "$TOUCHEGG_GESTURE_ON" == 'end' ]]; then
    xdotool keyup super
fi