Interesting. Perhaps the aircraft were forced to divert to that airfield for some reason, but are actually IJA aircraft.
The Japanese sites where I found some of the photos say theses were aircraft assigned to the navy for evaluation purposes.
Jim Lansdale at Jaircraft translated the tail.
"I think this this is [コ- ハへ-1 ] [KO-HA YA- 1]. KO is the prefix for test aircraft, followed by the kana for the first two syllables in HAYATE."At wars end the Japanese through everything into the fight it is possible even though evaluation aircraft they still may have seen combat.