The list of currently installed files/directories is:
/.
/usr
/usr/share
/usr/share/clockapp
/usr/share/clockapp/graphics
/usr/share/clockapp/graphics/Minute_Hand@27.png
/usr/share/clockapp/graphics/Second_Hand@27.png
/usr/share/clockapp/graphics/Location_Pin.png
/usr/share/clockapp/graphics/CMakeLists.txt
/usr/share/clockapp/graphics/Inner_Clock_Texture.png
/usr/share/clockapp/graphics/Background_Texture.jpg
/usr/share/clockapp/graphics/Hour_Hand@27.png
/usr/share/clockapp/graphics/Knob@27.png
/usr/share/clockapp/ubuntu-clock-app.json
/usr/share/clockapp/ubuntu-clock-app.desktop
/usr/share/ubuntu-clock-app
/usr/share/ubuntu-clock-app/qml
/usr/share/ubuntu-clock-app/qml/components
/usr/share/ubuntu-clock-app/qml/components/Utils.js
/usr/share/ubuntu-clock-app/qml/components/Shadow.qml
/usr/share/ubuntu-clock-app/qml/components/AnalogMode.qml
/usr/share/ubuntu-clock-app/qml/components/Background.qml
/usr/share/ubuntu-clock-app/qml/components/AnalogShadow.qml
/usr/share/ubuntu-clock-app/qml/components/SubtitledListItem.qml
/usr/share/ubuntu-clock-app/qml/components/Clock.qml
/usr/share/ubuntu-clock-app/qml/components/DigitalMode.qml
/usr/share/ubuntu-clock-app/qml/components/PullToAdd.qml
/usr/share/ubuntu-clock-app/qml/components/ClockCircle.qml
/usr/share/ubuntu-clock-app/qml/components/PageWithBottomEdge.qml
/usr/share/ubuntu-clock-app/qml/components/DigitalShadow.qml
/usr/share/ubuntu-clock-app/qml/clock-app@30.png
/usr/share/ubuntu-clock-app/qml/graphics
/usr/share/ubuntu-clock-app/qml/graphics/Minute_Hand@27.png
/usr/share/ubuntu-clock-app/qml/graphics/Second_Hand@27.png
/usr/share/ubuntu-clock-app/qml/graphics/Location_Pin.png
/usr/share/ubuntu-clock-app/qml/graphics/Inner_Clock_Texture.png
/usr/share/ubuntu-clock-app/qml/graphics/Background_Texture.jpg
/usr/share/ubuntu-clock-app/qml/graphics/Hour_Hand@27.png
/usr/share/ubuntu-clock-app/qml/graphics/Knob@27.png
/usr/share/ubuntu-clock-app/qml/clock
/usr/share/ubuntu-clock-app/qml/clock/ClockPage.qml
/usr/share/ubuntu-clock-app/qml/clock/MainClock.qml
/usr/share/ubuntu-clock-app/qml/ubuntu-clock-app.qml
/usr/share/ubuntu-clock-app/qml/alarm
/usr/share/ubuntu-clock-app/qml/alarm/AlarmList.qml
/usr/share/ubuntu-clock-app/qml/alarm/AlarmLabel.qml
/usr/share/ubuntu-clock-app/qml/alarm/AlarmSound.qml
/usr/share/ubuntu-clock-app/qml/alarm/AlarmSettingsPage.qml
/usr/share/ubuntu-clock-app/qml/alarm/EditAlarmPage.qml
/usr/share/ubuntu-clock-app/qml/alarm/AlarmRepeat.qml
/usr/share/ubuntu-clock-app/qml/alarm/AlarmPage.qml
/usr/share/ubuntu-clock-app/qml/alarm/AlarmUtils.qml
/usr/share/ubuntu-clock-app/qml/worldclock
/usr/share/ubuntu-clock-app/qml/worldclock/UserWorldCityList.qml
/usr/share/ubuntu-clock-app/qml/worldclock/WorldCityList.qml
/usr/share/ubuntu-clock-app/qml/worldclock/world-city-list.xml
/usr/share/doc
/usr/share/doc/ubuntu-clock-app
/usr/share/doc/ubuntu-clock-app/changelog.gz
/usr/share/doc/ubuntu-clock-app/copyright
/usr/lib
/usr/lib/x86_64-linux-gnu
/usr/lib/x86_64-linux-gnu/Alarm
/usr/lib/x86_64-linux-gnu/Alarm/Settings
/usr/lib/x86_64-linux-gnu/Alarm/Settings/libalarmsettings.so
/usr/lib/x86_64-linux-gnu/Alarm/Settings/qmldir
/usr/lib/x86_64-linux-gnu/Timezone
/usr/lib/x86_64-linux-gnu/Timezone/libtimezone.so
/usr/lib/x86_64-linux-gnu/Timezone/qmldir
/usr/lib/x86_64-linux-gnu/DateTime
/usr/lib/x86_64-linux-gnu/DateTime/libdatetime.so
/usr/lib/x86_64-linux-gnu/DateTime/qmldir
The files in 'backend' are missing.
Marking as high priority as this is blocking replacing the old clock app with the new clock app in the default images.