The bug

When one turtle egg is cracked, you can place more on the same block and they will be cracked, too.

To reproduce

Reproduction steps provided by moesh:

1. Generate world
2. Use command /setblock ~ ~ ~ minecraft:turtle_egg[eggs=1,hatch=1]
3. Grab Turtle Egg from inventory
4. Place another egg by right-clicking
5. Observe issue

Code analysis

Code analysis and fix by ampolive can be found in this comment.