Gameplay bug With Lux and tahm Kench

When Lux ults someone while tahm kench is eating someone, the champion that goes inside tahm kench still die even if they are inside his mouth. I was the adc that got killed by lux's ult while i was going in tahm kench's mouth... Can you please check if this is a bug or what ? Because tahm eats me, but even if im in the process of being eaten, i still die because of lux's ult....