The aircraft might have taxyed for the purpose of take-off, but it never landed. Quite obviously, nothing may be logged.
The first YF-16 test flight wasn't intended - the aircraft was supposed to do a fast taxy run only. So it left the chocks not for the purpose of flying, but then did so - the pilot experienced large roll / yaw excursions on the runway, so applied full power and sorted it out in the air, then landed!
Would he have logged the flight? Probably, but just for the heck of it as he would undoubtedly already have half a squillion hours anyway.
But did 'Taffy' Holden ever log his unintended Lightning flight at Lyneham all those years ago?