I have been doing the daily mission for a while to kill the feffoids in the cave and retrieve the Crystals.

However since today the crystal does not spawn anymore after killing the 15 feffoids.
I have tried to clear the cave 3 times but every time no crystal pops up, my time runs out and i automatically leave the cave w/o the crystal.

Yes im sure ive killed all 15 and yes ive checked the complete area over and over again but no crystal to be spawned.

Any more who experience this issue??