If you believe the account in History of the King's German Legion, then at Garcia Hernandez, 1812, a French square did have the two front ranks kneeled. And this square was broken after all...

The two front ranks, kneeling, presented a double row of deadly steel, while in rear of these, the steady musquets of four standing ranks were levelled at the devoted horsemen.

Beamish, History of the King's German Legion, vol. 2, p. 83.