Bug
This is the second time that an ETB ability does not trigger at all, Also I've been having trouble with the user interface as I uploaded in another report days ago.
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Rezzahan#77802 commented
You got yxour two Egg tokens from the Hatcher last turn, seeing it being summoning sick, so that ETB definitely happened. The Egg sac triggers at the beginning of your combat phase. So if you want to attack with the 3/3 token that would create, the Hatcher has to be played before combat begins. If it actually came from under the Fight Rigging, then too bad, that was already after the beginning of the combat, and thus the Egg sac never triggered, the time for that was already over. The Hatcher and the Egg have to be on the battlefield when you move to the combat phase.