Animation issue when including cross-fade and cross-fade-all

[AaronLayton]

There doesn't seem to be any documentation on when to use cross-fade and cross-fade-all.

If I set up my core-animated-pages with transitions="hero-transition cross-fade slide-down slide-up" and then specify some cross-fade and slide-down animations they don't seem to animate correctly.

<div cross-fade>
        <core-toolbar slide-down cross-fade>Demo</core-toolbar>
        <p>Demo page!</p>
</div>

if I change the core-animated-pages transition to cross-fade-all then it seems to work, but this then causes tile-cascade animations not to work correctly.

Can any one shed some light?