If land was held by bishops or parish priests then my understanding would be it belonged to the Catholic diocese.
What Catholic diocese? There were no Catholic dioceses or parishes in England for hundreds of years. Was the land supposed to just wait patiently for new Catholic dioceses to be organized so it can have an owner again?
If land was owned by the Archbishop of Canterbury, then we know who he is today–Justin Welby–and he’s an Anglican. An historical entity doesn’t cease to exist or lose all of its land just because it is no longer in communion with Rome.
And some of these comments betray a misunderstanding about how the Reformation played itself out in the church. There seems to be a belief that there is a hard cut off date for when the English Church ceased to be Catholic and became Anglican. That after this date all the Catholic clergy left their parish churches in protest and new Protestant preachers took over. But this is an illusion.
First, when Henry VIII demanded the English clergy submit to the Royal Supremacy and break from Rome, they did so themselves (either willingly or unwillingly). Yes, there were some clergy who refused, but they were punished either by deposition, imprisonment or execution in some cases. Therefore, the vast majority of Catholic clergy willingly went along with Henry VIII’s split from Rome.
And when Edward VI began his semi-Calvinist reforms, most of the clergy went along in some form or fashion, even if they were secretly still trying to keep alive as much Roman Catholicism as possible. Even with the Elizabethan Settlement, there was never a wholesale rooting out of the Catholic clergy. First, when Liz took the throne, there was already a severe clergy shortage, so deposing a bunch of clerics was out of the question. The clergy within the Church of England evolved slowly into Protestant clergy through natural processes of death and replacement, and some actual rooting out of overtly Catholic clergy.
The point being the Catholic and “Anglican” clergy for much of this process of Reformation were all mixed together in the same institution just trying to figure out how long this round of Reform or Restoration would last. There was no clear cut off between a Catholic church and a new Anglican church because the Church of England as an institution never lost continuity with the medieval English church.