OnUnitDestroyed Event not reliably issued

[mboedigh]

Most units that die cause sc2_api to issue an OnUnitDestroyed event, but I noticed that some of my own units hadn't been seen for many game frames. This should not happen for friendly units since they are always visible to yourself. I kept track when the event was issued and found it was not always called. I've only seen it happen after a large battle.
This bug must lie in a protocol problem or maybe sc2 itself, is not identifying all dead units.

[ImpulseCloud]

"some of my own units hadn't been seen for many game frames. This should not happen for friendly units since they are always visible to yourself."

last_seen is not updated when workers are inside a Vespene refinery/etc or when passengers in Bunker/Medivac/Dropperlord.

So, if you were just checking for a non-current last_seen with alive=true, this is not necessarily a bug. (for above examples)

@mboedigh Have you had any issues with this in the last year, or do you think the above explanation could be what you were seeing?

[mboedigh]

I think it is real and ongoing. In my discussion, I was talking about combat units not workers. I understand that enemy units might die out of sight, and that could, in theory, explain why I didn't get an OnUnitDestroyed event. In this case, it was my own units, and so that was not an explanation. I don't think it is directly fixable without Blizzard's help.