On Console, when you embark an attacking army that has already conquered a planet, the game crashes.

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Can confirm that it happens when u pull your last army off. However, I did this frequently with slave and clone armies and it never crashed. May be an issue exclusive to Assault Armies.
 
Yes. If you go to the army tab of the planet you can pull them off individually with square on the ps4 or x on xbox.

I tested it multiple times and it only crashed when the last one was removed. Annoying, but its a work around till they fix it.