This is inconsistent with all of the other automatic rifle and machine gun magazines. As for the amount of tracer per magazine that should be added, for CSAT it is also inconsistent. Once every three rounds for the Navid's 150rnd 9.3mm belt, once every five for the Zafir's 150rnd 7.62mm belt.

This only affects the standard magazine, not the all-tracer magazine

I should clarify: it does have the 5 rounds or so of tracer at the end like most magazines do, though it does not have any tracer in any other part
EDIT: This also affects the magazine for the SPAR-16S