I had a similar situation. I don't know how we missed it that my Spouse's passport was soon expiring. We only realised it when we received our GCMS notes few days before the expiry date of the passport (6th March). We immediately initiated the renewal of the passport but we could not get it before the expiry date
We were sent an additional information request to upload new passport on 7th March (deadline of 14th March), we uploaded the new passport on 11th March. We did not hear anything until 31st March when our BG changed to "in Progress" and a ghost email after, which I believe is the notification for the background status change.
So do not worry too much about it. IRCC might look at your file immediately or might take another 1-2 weeks before they revisit your file. If they had wanted to reject you, I doubt they would have requested for new passport for your kids.
Thanks Lodo, cjs and dupsy. It was stupid of us not to get new passports earlier but we really didn't realize.. I hope it doesn't get stuck for very long, I feel I'm losing it. Did you guys get ppr yet? Dupsy I'm also hoping they asked for this update for a good reason..