Why when I open the cell of an SCP, it does not escape. And also when shot through an open door, the bullet impact explodes on an invisible wall as if the door were closed.
The SCP didn't escape because of how their AI works. At random intervals, the SCP will wander to a random location within a certain radius to it on the nav mesh. It's only going to escape if it detects a player near by that is not a chaos insurgency or it picks a location outside of the containment chamber. I know it's unrealistic, which is why I'm going to upgrade the SCP AI in future updates.
The doors having invisible walls was a bug I thought I fixed a long time ago where both door panels would open client side but only one would open server side. It's going to be fixed in version 0.6.1, so thanks for finding it.