Harbinger sextant mod behavior needs to change on Elder Guardian maps

So in any other situation where something interacts with the map boss, on an Elder Guardian map this will either happen at the beginning an persist (Maven witness, Possessed) or only show up during the third phase (Ritual)...

...but not the "Map bosses are accompanied by a mysterious Harbinger" Sextant mod. He'll show up during the first phase. And let's say you defeat the Harbinger just as the Elder Guardian phase happens? Well fuck you buddy, you're not getting any of those Harbinger drops because you can't backtrack in the Elder Guardian area at all. I only lost a Fracturing Shard out of this, but there are much more valuable drops you can get from Harbinger encounters.

What's mystifying about this is that Destructive Play, which was only just introduced this league, behaves like everything else and the bosses it spawns only show up during the final phase. This is definitively a bug/outlier that needs to be fixed.

This is technically a repeat of this report, but considering that post is almost 3 years old and got archived with 0 replies, I'd say this warrants a new thread.

Bug report 3597312962, if it matters any.

I would love to know if this was fixed, as i was just about to go running a bunch of elder guardian maps with the harbi compass.

Nope, behavior is still as OP describes.