As someone whose expertise regarding jet engines is pretty much confined to "spin it, chuck fuel in, set fire to it, go flying", is it possible that such a large concentration of reasonably sized insects could have blocked probes etc in the intake and upset the FADEC or similar TMS or whatever?
FADECS are typically programed to synthensize missing parameters from the aircraft like inlet probes. However it might (outside of my experience) be possible for bee juice to screw up internal engine probes that set the bleed operation for accel conditions. This certainly sounds like a one-off to me and the outcome was well managed.