I had this with a timer throwing 2 single hours into night on my last gelato grow just as buds started forming on 2 and 1 fatter bud,only noticed possibly 2 weeks later when it started throwing new shoots and vegging again. Most buds turned into fox tails,stalled them a couple of weeks and best one is still throwing shoots after I cut them all off,but is about done.
So yeah it kinda screws things if you're unlucky.
Good luck