Did you collect some fertilized Rock Drake eggs when you hunted some down in the Drake Trench? Did you try to hatch that egg? Did it vanish once you dropped it? Yeah, that's a bug that we cannot fix.
Let's go over why this is happening. These fertilized eggs that the Rock Drakes have a chance of dropping are technically considered "Admin Spawned Eggs". This means that each egg is level 1. These level 1 eggs "die" when they're dropped because there isn't enough ac's or fires to support their already 0 health.
These eggs have been hatched on our server. It does take roughly 58 AC's placed in a close vicinity of one another. You also have to step as close as possible to the AC before dropping the egg. The video below demonstrates at around 5:00.
So, yes. It is possible to hatch the fertilized Rock Drake eggs you've been collecting on our server, you just need more AC's closer, possibly clipped together, and to try dropping the eggs closer to the AC's. If it's still not working for you, and you've now lost all of your Rock Drake eggs, that's ARK! You can always purchase a Rock Drake from the Admin Shop.
The Eggs produced on Aberration and found in nests will not have this issue.
You could also use our public hatchery at the Community Center at Small Islands. The Rock Drake eggs can be dropped and hatched safely there.