`EndOfTrack` is never present, even after adding it

[Boscop]

I've noticed something weird:
For some reason, even if I add EndOfTrack to the end of each track before writing a SMF, the resulting SMF data never has any EndOfTrack messages. Any idea why?
Also whenever I parse a SMF, and print it out, there are also no EndOfTrack events.
Are they "transparently removed" during writing/parsing?
Do I even need to add EndOfTrack before writing a SMF?

[Boscop]

Hm, or maybe it's just the case for otherwise empty tracks that midly removes EndOfTrack?