I entered Gate A, and the guards weren't shooting at me for some odd reason. Another odd thing was when I went to push the button you open the door which activates the ending, it said "you push the button but it doesn't do anything". I tried no clip to test it out, but even when I went through the door the ending still didn't activate.
This is the second Gate A ending as I have captured SCP-106.

This seems like a bug that needs to get fixed.

From my knowledge the Gate A ending is supposed to be like this:

[youtube]WwsrhP0WesE[/youtube]

Though I have heard about other players having this issue before, I think noclipping in this part would be fatal one way or another.
But then, maybe the guards didn't properly activate to begin with.

I'm not sure if it has something to do with me capturing SCP-106, but yeah the guards weren't activating.

Well, Gate A has two endings.
One that activates when you catch 106. And one that needs 106 to be free.

Hmmmmmm I'm not entirely sure why the guards weren't activating. I did exactly what that video you showed me did, and nothing happened. However when I entered the elevator it popped up with a quick loading screen that loaded quickly.

It's a problem with the new pathfinding function, it's trying to get out-of-bounds values from an array, which can cause a Memory Access Violation.

Ah alright. Well I hope this bug gets fixed in the next update!