OLL 54
L · 3 of 9 top stickers yellow
r U2 R' U' R U R' U' R U' r'11 moves · Probability 1/54 · Mirror: OLL 53

Setup: apply these moves to a solved cube to reach this case
r U R' U R U' R' U R U2 r'L · 3 of 9 top stickers yellow
r U2 R' U' R U R' U' R U' r'11 moves · Probability 1/54 · Mirror: OLL 53

r U R' U R U' R' U R U2 r'