Disclaimer: This solution is not reachable from the starting position, butand is technicallynot reachable in a game of Chess960 (thanks Rewan!).
[FEN "3bBNRN/2pPpPKQ/2P1P1PR/7P/p7/rp1p1p2/qkpPpP2/nrnbB3 w - - 0 1"]
Why does the solution here not work?
This is clearly not reachable from the starting position (because of the bishops stuck on the first rank), but the question does not state the position must be legal.