Will be interesting to see if we will ever get to know the real cause.
There is absolutely no reason why we shouldn't, however in any case the real cause would be "leaked" at some stage.
I am also surprised at the B2 variant used (not that it makes much difference in this case) as I have never actually seen a flyable one in fifteen years plus in Russia and many of the CIS countries (being mainly UZ/KZ/GE) as well as Ukraine... I thought most were withdrawn by the 90's.