To no one’s surprise, they don’t. Dr. Jason Lisle made a big deal that the speed of light measurements were always two way measurements and that GR allowed c to equal c/2 in one direction and infinite in the other direction. He called his solution to the distant starlight problem Asymmetrical Speed of Light with the center of the expanding universe right here on Earth. GW170817 was a one way race between a gravitational wave and a gamma ray across a large distance to Earth. It was a tie. Speed of GWs and LWs finite and equal to c.