Personally, I’m thinking a power interrupt to explain the partial ping is plausible. If shortly after the 0811 ping the left engine were to flame out, that would cause a momentary loss off AC power to the left AC bus (Satcom unit powered by the left AC bus) would it not, until auto AC crossfeed joins the AC busses.
A momentary power interrupt could cause the satcom unit to reboot and re-establish the satellite connection, this could be interrupted by either a steep bank to the left shielding the antennae or a flameout of the right engine removing all AC power available to the satcom unit.
What do you think. plausible and worthy of a forensic investigation or impossible.