Last night I had an invisible EV whilst defending in Chapel.
The ev had no collision so I was able to shoot the repair guys behind the invisible ev.
I was still able to cause damage to the ev via laser and supposedly by bullets, at least the cross-hair turned red.
Before this issue occured I also noticed two other issues: when I pointed the laser on the ev during the Ready-up phase, the laser would correctly start at the ev but then would immediately rush to the left towards attackers spawn (although i kept the cursor on the ev).
Second issue was, that irrelevant HUD information kept being attached to my cross-hair and wouldn’t go away until the ev was at it’s target area and the next objective was initialized.
I had this issue twice now, once in closed beta and now last night. I can’t tell what triggered it exactly because i can’t think of anything that i did in that case that i havent done alreay a thousand of times. So, sorry about that 
I’ll edit this post if it happens again and if i know more about the issue.