I know it should already been fixed in 2.0.3.
Therefore, I just kill Lilith with 2 of my friends today.
All of us completed the season journey and got one spark already.
After killing, we check how many sparks there.
One of them have 2, the other have 3, and I have 1 only
We tried to kill Lilith in different torment level, and I still can’t get the spark from Lilith!