Looking at the pictures taken early on Thursday, we can only find one with 8 beaks (or glimpses of beaks) showing.
This, and the entry for Friday have not been easy to write. One of Bella's chicks died some time before Thursday afternoon, but we didn't notice until Friday morning. Using Replay, you can see that during Thursday, there are many more flies buzzing around than you normally see, so perhaps this chick died on Wednesday or even earlier! Bella discovered it today (Thursday) and tried to remove it from the nest box, but failed.