Are there surviving Shetona villages in Yyasulani?

[Cleretic]

It definitely was pretty jarring for a story full of acknowledgement and respect to the local cultures, to not even comment on their effective real-time nuking of the north, its environment and inhabitants.
Doubly-so when they went to such efforts to show the loss and morning of the ~50 people during the invasion.
Out of sight, out of mind?

Presuming you're talking about Yyasulani, I think it makes sense in context, when you recognize the context is really weird.

Right off the bat after Zoraal Ja's attack, emotions are heightened and a little weird; yeah a bunch of people died, including the king, but they died in an attack; people are mourning on the small scale, but that understandably transitions into anger and retaliation. The warpath to Heritage Found is clearly fueled by rage, which is actually especially noticeable with Wuk Lamat, the girl who's rarely actually been angry before that point. They don't really know what's happened to Yyasulani, so there's not necessarily mourning to be had there either, and in the face of that kind of disaster people are inclined to cling to hope. Even if Yyasulani's chances aren't good, people are gonna go 'maybe my friend out there is alive'.

And then they get into the dome and find out that Yyasulani is fine but it's somehow been twenty years. Yeah, people have died, but they've died to things like sickness and old age. There's not really someone to be angry at there, at least until you get into the complicated nuts and bolts of things, and at that point it's hard to whip masses into a frenzy; people rarely get excited about complexities.

In the final Dawntrail cutscene we learn that there's a proper royal funeral for Gulool Ja Ja being planned, which has presumably either happened off-screen or will happen in the future. So the process of properly mourning this in Tural has actually been happening, it's just probably not a fun thing to watch; at least Sphene's funeral was plot-relevant.