Large Soul Core Despawned

I encountered an issue in the "Legacy of the Vaal" quest during Act 3 (Cruel). After defeating "Zicoatl, Warden of the Core," I received the "Large Soul Core" item. However, after completing a side quest, the item disappeared from my inventory.

When I attempt to place the Large Soul Core on the stone altar in the Infested Barrens, the animation of my character placing the item plays, but nothing happens. I tried defeating the boss again, hoping the Large Soul Core would drop again, but it does not.

I Got same problem how to fix?

The issue is still present