Electrical/ReversePolarity

The positive pin of a polarized part is at a lower known potential than its negative pin.

led :D1, anode: "b10", cathode: "g12"
# Connect anode to GND and cathode to VCC.

Swap accidental reverse connections. For an intentional reverse-biased LED, use bias: :reverse. Part definitions can declare max_reverse_voltage; ordinary diodes are not flagged by this rule.