They're been able to damage through walls for a very long time. The change where you couldn't was very recent, hasn't ever hit the public builds yet. We can bring it back later, if we figure out how to avoid the "stair bug" (missing splash that otherwise seems like it would hit, because of a mine or rocket being lined off by a corner in the terrain) and spawn rockets/mines at the closest part of the barrel that isn't inside of an obstacle, instead of always at the end of the barrel, even if it puts the projectile inside of something solid.

Anyway, I have some other commits coming up and one of them fixes a bug with the tracer change somewhere in here.