12s Chain with 11s Shimano Ultegra R8000

Im not fortunate enough to have 12 sp but my last bike was 10sp but I ran an 11sp chain on it for at a guess half of its 40,000 miles. I suspect she’ll be fine with a 12 spd chain. Chains are identical on the inside and its only the side plates which are thinner for fitting into a more tightly packed cassette.