IIRC, at conventions in the late 80s, Richard Arnold would often be asked questions about the USS Ti-Ho, which Shane Johnson's "Scotty's Guide to the Enterprise" book speculated was the just-completed ship hastily rechristened Enterprise-A at the end of ST IV.
Instead, he'd tell about how the Star Trek Office had decided for themselves that it would more likely be the new Yorktown - a real-world homage to Gene Roddenberry's first choice of a ship name in his early Star Trek proposals. (Essentially, it was a resistence to let a licensed tie-in influence the source material, but it didn't attempt to take into account that one of the little filmed pieces for ST IV's monitor screens was already showing an existing Yorktown.)
Obviously, an intended replacement had been built but the original had not yet been decommissioned.
Instead, he'd tell about how the Star Trek Office had decided for themselves that it would more likely be the new Yorktown - a real-world homage to Gene Roddenberry's first choice of a ship name in his early Star Trek proposals. (Essentially, it was a resistence to let a licensed tie-in influence the source material, but it didn't attempt to take into account that one of the little filmed pieces for ST IV's monitor screens was already showing an existing Yorktown.)
Obviously, an intended replacement had been built but the original had not yet been decommissioned.