My indirect arty is no longer shooting thing I don't see, but it seems that:
bug #1 I have a mobile sensor, and playing on web with fixed teams if my buddy has indirect arty and I target an objective, his indirect arty will shot at my target even if my radar cannot see it.
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bug #2 when I'm trying to get an artifact, with a mobile sensor vehicle, all my arty will shoot at the artifact (it does not gets destroyed, but my arty needs to reload and all that... annoying)