Adobe Animate 'Layer Depth' - Not working inside symbols only on root timeline

For those who do not know, Adobe Animate Layer Depth feature is awesome for animation.
The ability to move layers up and down the stacking order as part of an animation is great.
Eg: Put an arm in front or behind the character as they gradually turn.

Unfortunately it only appears to work on the root timeline which is very short sighted to say the least and not at all useful. Probably due to a technical constraint hopefully ?

When inside a symbol the Layer Depth panel is active but none of the layers can be moved up or down the layer stack? The individual layers in the symbol are visible they are just not working. This is where it makes the most sense to be functional when animating cleanly inside a symbol.

So to make my long-winded point.... when will this be enabled fully within a nested symbol?