Myanmar is pretty clear. A military dictatorship is bombing its own country to kill rebels with no regards for civilian casualties.

The real reason is that it can’t be propagandized. Myanmar doesn‘t have close ties to the „West“. Our governments did what was expected of them (giving humanitarian aid and condemning the dictatorship), so the oppositions don’t have anything to blame them for, and the supporters don’t have anything to ridicule the opposition for, leading to it fading out of the regular news cycle pretty much immediately.

The people who actually care about the victims involved in even the propagandized conflicts is vanishingly small. The vast majority just cares about their government‘s role in it.