I think I narrowed down the cause of the crash-after-tether-unloading. The wlan interface is named eth0, but the tether is wl0.1. I manually turned off wl0.1 via "busybox ifconfig wl0.1 down", then "busybox ifconfig eth0 down" printed "No such interface" and "busybox ifconfig" caused a hard crash similar to how it behaves via the GUI unload.
-- Starfox
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