Can AL4 leveling plug fall in the transmission?

[Arkis]

Hello,
We got an oldie but really nice Peugeot 206 1.4i 55kW, 2005 with AL4 automatic transmission for my wife as a first car.
I am currently doing oil change on the transmission, but I am a little hesitant about installing the leveling plug back. The leveling plug does not have "a lip" and I can't see inside the hole because the oil is dripping from there.
I am worried that if I tighten the plug too much it will fall into the transmission. Or is there any "lip" inside that prevents the leveling plug falling into the transmission?

[wheeler]

Dont worry, it would be a really bad design if the level plug was allowed to go right inside.
Here is an internal cutaway pic that shows it butting up against the inside of the box.

[Arkis]

Thank you very much! I was a bit worried because it kept going for longer than I remember unscrewing it.
It really bottomed out only a few turns from my point.