In one of the tourney games yesterday the enemy team had vision on my stealth acu while I was submerged and outside of radar/sonar range. No enemy units were close to it, but it was possible to see the acu model and even the upgrade animation. I was not powerstalling or anything (and outside of the intel range).
Look at super's perspective at then end of the replay where my acu stands close to his base (outside of radar range). The same bug also affected QueerNoob when he was attacked by torpbombers earlier in that game.