Wouldn't it be the same case if you just have the bedroom door open? Like if just the door is open with no windows open.

Wouldn't you still get some airflow through convection ?

The apartment faces East and West, so as long as the kitchen window is cracked open, the air moves, not even a closed door stops it, it just travels through the small gap at the bottom. Nearly knocked me down once with how strong the gust got.