Final "Support Specialist" challenge is incompleteable

Greetings,

As the title says, I am unable to progress on the first Support Class challenge, which requires me to heal players with my medbag. It got stuck at 2.301/5.000 and doesn't progress any further no matter what I try.

Most challenges seem to be having a hard time registering progress (the final shotgun challenge took me three 5-kill streaks without reloading to finally count), but this one is just broken.

Kinda disheartening to play the game when you can't unlock the gadgets for your class...