Minecraft dragon egg gone in skyblock, where is it?

I've made a skyblock world where there's a block that keeps coming back. Then I just killed the dragon and the egg a lot into the portal. Then it was on the infinite block and I clicked it. Then it was gone and since my island is quite small, I didn't find it either.

Does anyone know where it is?

That must have fallen into the void.

OK thanks for the answer.