On some maps, I observe such a picture, when connected to the server after the start: the doors open, the blocks move, and so on. This is due to the fact that the state of the client level does not correspond to the state of the server level. Everything you see, for example, closing the door, is nothing more than animation.
You will not be able to go through the door until it “closes” or forward a teleport through it, because the server is counting on these actions, and the door is closed on its side. It is only an illusion to synchronize the client level with the server level.