[FS#662] Sysupgrade messes up Ubiquiti Unifi AP AC Lite

[LEDE Bugs]

The following task has a new comment added:

FS#662 - Sysupgrade messes up Ubiquiti Unifi AP AC Lite
User who did this - rotanid (rotanid)

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this issue also affects sysupgrades on similar devices like Unifi AC Mesh and Unifi AC Mesh Pro. (AC Mesh is similar to Unifi AP AC Lite and AC Mesh Pro similar to AP AC Pro)
there's also a downstream issue at the Gluon project: https://github.com/freifunk-gluon/gluon/issues/1301
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=662#comment4088