Blast command won't penetrate barbed wire fences

[A Canadian Cat]

Yes, it is normal. Not very desirable much of the time. The issue is that the Blast command is a movement order. For blasting bocage it is a really big problem to run through afterwards - as you can imagine. So, for bocage it works to blast along the hedge line instead of through it. They your engineers do not go through. I have no idea if the same thing will work for wire but it would be worth a try.