when the game loads, shove voles escape pneumatic door.

I have a bunch of shove vole enclosed with pneumatic door, which prevents the shove voles to escape. However, when the game loads for the first time, it seems like they are able to escape it. My previous game play doesn't seemed to have such an issue, but this happens to a new game. I am not sure if this is considered to be a bug but considering the fact that this does not happen to my previous saved games, I think it is a bug. I've recorded the bug, but the video exceeds the size limit of what I can attach here. If you need a copy of the video, I can provided if you can give me somewhere to upload it.

Thank you.