For some reason at this point, I was stuck and unable to finish the challenge because there's no more larvas. The larvas you see in the screenshot is the last larvas I have. After taking this screenshot, I went out and killed a tiger beetle and brought some food in, lost half of my soldiers from that fight then I came back to the ground and noticed that larvas are not being made at all. I had one worker left which should still be able to put some larvas. But the worker just stand and walk around the queen and do nothing. I put all of my ants into nest group and nobody do anything.
I am pretty sure this is a bug. Just wasted an hour of playing that challenge.
Screenshot:
I am pretty sure this is a bug. Just wasted an hour of playing that challenge.
Screenshot: