No damage sound?

[Blakduk]

I noticed today while flying online that i wasn't hearing any sound of my plane being hit when i was being shot.
I was flying straight and level in a 109 chasing some bombers when i saw a message flick up saying i had a weapon failure. 'Odd' i thought as i saw another message pop up saying i had a small fuel line leak.... then i noticed some tracer and i bunted down into a split-S. Then i finally saw a sneaky Spitfire had sneaked up in my blind spot and scored some hits on me.
What i realised afterwards was that i heard no sounds of any plane strikes. All the other sounds were working okay including my engine and radio messages.
Has anyone else noticed this?