I can confirm this.

For me it was mostly like that, missile warning system kicks in for a second then it stops. At first I thought that the missile hit the obstacle but after few seconds I get hit. After few times of missile warning system failures and being hit I understood that this was a bug, because a day before the update (1.66) it was fine.

I was flying in A-164 Wipeout.

In T121737#1542506, @razazel wrote:

@Storm117 @Matosh
Do you have any closer repro for this?

So far it seems this mostly happens in PvP situations in MP, can you confirm?

I was simply flying, entered anti-air threat area, only for a second I receive on the radar indications about the incoming missile (visual and audio), after that second I thought the missile hit something else (hence the second short warning), few seconds later I get hit without any indication or warning. Anti-air threats: ZSU-39 Tigris in a convoy patrol, and MANPADs from the OPFOR controlled town/sector.

Was playing on a MP COOP mission called co40 Domination! Blufor [3.62].

From what my test have shown AA tanks are 100% of the time bugged. Manpads are sometimes working correctly, but not all the time. I tested this now in every vanilla jet - it is always the same.
I play PvP.

Also your mention: I talked to Roid about it and his videos basically show the bug very well.

Thanks for the heads up, I just wanted to confirm that we are on the right trail (that is that it is linked only to MP) not to miss anything. :)

In the Editor they work normally, tested in Wipeout vs Tigris.

Update fixed it for me.