Here there is a function (p135) called get_fast_modinfo() which does not contain any facetoface instances at course = 1.
Originally this function is located in /lib/modinfolib.php and it calls course_modinfo::instance() on the same page;
This is everything what I found so far, I started to be familiar with that class but it is extremely complex (or I am tired).
I is also worth to check cm_info class in the same file, it might be the key to understand what is the problem with the facetoface plugin.
I hope it helps.