Express Train Assignment will not keep track of progress

In the assignment "Express Train" which unlocks the F2000, every round the progress towards "Get 10 kills inside the Metro" and "KIll Assist Ribbon x2" resets, only "Assault Rifle Ribbon x1" is kept.

It's annoying since getting those 10 kill assists in one round+10 kills, is hard, especially with all the crashes.