Thx! And, to clarify the situation I copied this comment from @Sarah link.

It’s not a “plug type door”. It’s a plugged door. They’re different things. This isn’t a door at all. It doesn’t open.

Indeed it’s NOT part of the fuselage (plane frame), it was built as an empty socket for the placement of an eventual (extra) emergency door, depanding the seat configuration. In this plane they did a faulty install of a " plug-in "instead.