It’s a given that not all eggs a goose lays will be fertile. In other words, there is always a chance that a goose’s clutch will contain bad (infertile) eggs
Inexperienced or new mother geese are more likely to sit on bad eggs than experienced mothers. Since it is their first time, they may not necessarily know when their egg has spoiled.
If you ever notice that your goose has abandoned its eggs, you should inspect the clutch. This way, you might be able to save the good eggs, if there are any.