The only possibility would be that the nose gear was never locked in the down position from the prior landing and the moment a tug attempted a push back, it collapsed.
I included a link in Post 9 about a similar incident from 2021, which was determined to be caused by faulty installation of pins when attempting to clear error messages associated with the nose landing gear doors. When the switch was cycled, the landing gear raised and the nose dropped.
There is no tug in the photos of either event.
https://simpleflying.com/british-airways-nose-gear-collapse-aaib-report/
"...the aircraft was producing three fault messages associated with the Nose Landing Gear doors... the Dispatch Deviation Guide asked the maintenance personnel to cycle the Nose Landing Gear selection level with hydraulic power applied to the aircraft. The procedure required downlock pins inserted in the nose and the main landing gear locks to prevent the landing gear from retracting during the cycling process... According to the Air Accident Investigation Branch, the Nose Landing Gear downlock pin was incorrectly inserted in the downlock link assembly apex pin bore instead of the downlock pin hole. Due to this incorrect insertion, the Nose Landing Gear retracted when the lead engineer pushed the lever up. As an unfortunate result, the nose of G-ZBJB struck the ground..."