i want to create a factory here, but this gate looks closed, in map editor its open what is going on? in other server i used to play it was open

Some objects, like this gate, are created by the mission scripts because they're part of a mission:

c
//Door for casino3.sc    
VAR_INT ca3_loadingbay
CREATE_OBJECT_NO_OFFSET shutter_vegas 1055.629 2087.67 12.469 ca3_loadingbay
DONT_REMOVE_OBJECT ca3_loadingbay

But they can be removed with a normal RemoveBuilding call. See also: https://dev.prineside.com/en/gtasa_samp_model_id/model/2938-shutter_vegas/

i dont get it

Because it is not part of the normal map! You need to manually add a RemoveBuilding line to your code with the above model id and coordinates.

Nice rockstar moment

thank you

There are plenty of other areas where objects are added by the mission script; they need an object handle (objectid) so the script can can keep track of them. How would you find a random gate in the world without it having a handle? The hole in SF is another such example. The blast doors in A51 also count, although interestingly I think SA-MP does remove those

there's so nice