[J_E_F_F]

So far, no lightning bolt with 0313, perhaps this was a firmware issue that was resolved.

Not explicitly but there was a change to the gpio expander which is used by the under-voltage detection, but nothing that looks like it would fix your issue.
It may be something a little random that comes and goes with builds.

Can you confirm if the symbol ever disappears and reappears?
Or is it just spuriously on at boot and either stays on permanently or disappears, never to return?

It does sound like spurious reporting of under-voltage rather than an actual under-voltage condition.
Also if you see the symbol again, can you report output of "vcgencmd get_throttled"

It stays on permanently

Updated from 0301 to 0312 and the lightning bolt icon appeared, solid lightning bolt from initial boot time, at idle, playing a video whenever, solid lightning bolt..

Can you just confirm you don't have any custom config to disable the power LED?

I do:

Code:

# cat /storage/.config/autostart.sh
(echo none > /sys/class/leds/led1/trigger)&
(echo none > /sys/class/leds/led0/trigger)&