I noticed, through a mod that allows you to sit, but also sitting on minecarts or boats, I noticed that the position of the body model is positioned a lot behind what appears in the 3rd person view, which, for example, in the minecart the legs come out almost halfway, but in the first person view (with the mod active), the feet barely come out.

I don't know if this bug/graphical issue is so serious but if the mod owner can do something about it, it would be nice.

That's actually a feature, the body is offsetted behind the camera a little because otherwise if you look down you would just look at your neck. You can change the offset in the settings.

If it still feels wrong after changing the settings of the normal offset I could also look into adding config options for custom sitting offsets, but I can't guarantee that it works 100% with other mods that via some way allow you to sit.

just do it