Hi Krusty,
I have noticed an apparent rubber bullet problem as well, after the release of 2.11. Not specific to one plane though. It has been happening with a variety of planes and it doesn't seem to be a constant either. Sometimes it seems to happen; sometimes it doesn't.
For instance, I unloaded on a C-47 at 300D from its six in straight and level flight with an La-7 after I had BnZ'ed it without results. Eventually it simply blew up but without any damage indications that it had been previously hit until it eventually just exploded... and it took waaay too many rounds to knock it down.
TIGERESS