It seems that Tzeentch’s curse of crystal egg is being overriden by quest of defeating chest guardian. Existing egg disappears and never shows up again.
This happened twice to me: once as a host, once as a client.
Steps to reproduce:
- Play Chaos Wastes.
- Get a map cursed with Tzeentch’s crystal egg.
- Find a chest and activate it before destroying existing egg.
- Kill the monster, see no more eggs in your way.
Here’s the video: