HE-VT is not detonating Bombs and missiles

HE-VT from my 40mm VEAK & Lvkv 9040 should detonate bombs and missiles but they aren’t. I’ve even tried 155mm HE-VT and still nothing. Those things still flies on a death course unless my 7.62 MG hits it a few times then it goes boom!?

Womp womp

Indeed Womp Womp