On multiple occasions, both the science and engineering teams i have will misfire. I can deploy them and they do nothing.
In one particular instance in recent memory, in PVP, i fired off science team and got no shield boost whatsoever from it. I wasn't being fired on, just finished a battle so that wasnt the issue, but firing sci team did no shield regen at all.
In a PVE instance on multiple occasions (including against the CE in fleet action), i can fire off an engineering team, see the animation of it working, but it doesnt repair any hull whatsoever or increase regen/repair rate on anything. Just plays the graphic and then coolsdown.