[Bug] Galactic Emperor drop nothing

I kill Galactic Emperor very close range(like overhead, front chest) and it drop nothing or drop just buff bubble(like speed, overshield). can’t get score bubble, bonus score and gears
first time, I think got everything in same time so system don’t want to tell my reward but it’s not appear in result.
I suffer this situation four time.
damn I need ‘Firmware Update 1.51C’ and ‘Poor “M-Pulse” Controller’. play same stage 50+@ time is too tired

Firmware Update actually drops from Geoff iirc