So, we've made a step in the right direction since my last bug report on this.
You can now successfully re-color her butt in the arsenal, however, it still does not change in game. As shown below.
So, we're really close to actually being able to successfully recolor Khora's butt with the Urushu skin, but we're still not quite there.
more patches, no resolution.
As of Angels of the Zariman: Hotfix 31.5.3, this issue still persists.
please can we get acknowledgement from DE about this issue? The back of Khora's head is permanently light blue even when her butt changes color as intended. Either make neither change color, or both change color, but they're clearly meant to match.