I retest this on a BB10 and result is a meeting response does not defect. Attachment is screenshot on BB10.
Environment Details:
BES server : PIM05
Mail server : U1: EX2010, U2: Domino9
Device: U1: Z30, U2: Z30
Device Version : U1: 10.2.1.3265, U2: 10.3.0.428