Resplendent Spark not dropping from Uber Lillith first seasonal kill

Decided to try and push for uber lillith today… took many tries to deal with it and i finally got it down. she dropped 2 awful items and no resplendent spark.

Ive read several topics on here regarding the “not dropping resplendent spark on first kill” and its been going on for like a month. Would really like my seasonal item for crafting, that wasnt exactly a tedious effort, especially since im not playing some one shot/invuln build.

I also dont understand how the clearly and by far most difficult encounter in the game drops far less and worse loot than any other boss. but thats beside the point.

Please deliver Resplendent spark that i earned, thanks.