Hi, if your light period is under 13h/day, it should not be re-veg but much more probably stress (you change the light), it looks like "Fox tailing"
The main reason about cannabis foxtail, indoor, is stress due to light.
If you switched your light at week 11, it probably shocked the plant.
Foxtail could also be a genetic attribut to some sativa strains.
I am pretty sure it's a combinaison of your strain genetics and the light stress.
Nothing to do bro.
Enjoy your harvest
Take care