The v1.17_4 version specifically focuses on ensuring that the 1.17 "Caves & Cliffs: Part I" content matches the classic pre-1.14 look.
Addresses issues where the built-in Programmer Art pack fails to change certain entity models or textures, such as Villagers or newer Nether mobs. Developer Art Classic (1.14 – 1.17) [v1.17_4]
Replaces the modern main menu and interface elements with the classic, darker wood and stone textures. The v1