UPGRADE) PS4 Ghost of Tsushima DIRECTOR'S CUT

Why does the ghost of Tsushima ps5 upgrade cost $19.79 if I already own the ps4 directors cut version? : r/playstation

Ghost of Tsushima Director's Cut [PS4] (Unboxing/Offline/Experience)

Can anyone help? My director's cut copy of the game for PS4 (images for proof) is getting recognised as a base game and won't let me upgrade to the ps5 copy of

Mejora a la VERSIÓN DEL DIRECTOR de Ghost of Tsushima

How to UPGRADE to Ghost of Tsushima's PS5 Director's CUT, downloading, PS4 saves, version