You should not be able to design a board like this, even if the voltage and current across the traces is small, this is a failure about to happen anytime on a power led board like this:
I mean, those are about 20 mils for nine watss power leds, it’s just silly.
Good thing is, that board is not ours. It was sent to us by mistake, along some other boards we had to repair.
Some laughs along my bosses later, we packed that in the box and never looked back.
Silly, silly pcb designers…