The mute flash forced the green LED off; on un-mute it was blanked instead of
restored, so a call in progress stayed dark. Restore green from the current RX
state (active DMR slot, or FM/digital signal received) on un-mute; the normal RX
code keeps it correct afterwards.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>