Not the first time….very early 76 daze many years ago 2 Training Capts had a similar event in Australia. Disabled the gear warning while practicing something…then wandered back to the airport, shot an approach to land. Can’t recall if they touched down or just broke some antennas.
Heard of it nearly happening many years later . Saved by the PNF memory “Finals Check” : “ Brake, Gear, Radar, Floats, Deck ID”