During Panic Room mission sometimes when i enter the second room i get mission failure status straight away. And other time I don't until I get to the VIP.
So my suggestion is at the start of the mission when Metrodora Thelema states that you have a few Terran minutes until door beach. Is it possible to have a "Hit point bar" for the door in the Mission UI. Something similar to the "Silence the Guns" demolition UI.