OK ... I had that bug and someone told me to try NOT TO DIE doing it and that it should complete ... I tried and YAY !!!! If you do it this way you're good to go !!!
1- Follow instructions and attack Imps or retreat to protect your Capital Ship and on the ISD battle, follow the orders to target the Power System first.
2 - DON'T DIE !!! If you do, just restart the tutorial else you won't be able to complete it.
3- DON'T DIE !!!!! Ho I already said that 😉
I tried it 3 times but I died every time and it was stuck at 1% Health on ISD, I did it without dying and TADA !!! The ISD Power System registered destroyed and I could get the ISD to explode.
Buggy but doable.
