Are you using plywood? I’m not sure what the aura can cut, but if you’re using something like baltic birch-or plywood in general, there is a flashlight method of finding the voids so you can avoid them.
Just take a really bright flashlight, i think even my phone flashlight worked, and press it against the back of the board and move it around while looking at it from the front. The parts that won’t cut will light up like a spotlight.
There are a few threads in the forum that show pictures. I usually circle them in light pencil and place my work so that I’m not cutting into them.