Ah, apparently this has come from the club itself:
_Oxford United have held three licences since the Stadium was constructed. These are:
An Original licence dated 21st March 2006 that was originally due to expire in 2026 but was terminated by Firoka (Oxford United Stadium) Limited on 9th May 2021;
A short licence that permitted use until June 2021 to allow a play-off match to be played in May 2021; and
The current licence which started on 1st July 2021 and expires on 30th June 2026.
Under the terms of the original licence and as a result of Covid 19, Firoka (Oxford United Stadium) Limited terminated the original licence which it was legally entitled to do. The current licence terms were subsequently agreed to allow continued use until 30 June 2026._
I have to say, I'm absolutely staggered that this wasn't reported on at the time.