Minecraft wiki entry for Texture_Update, associated text: On April 1, 2018, the Texture Update was "released" on Java Edition as an April Fools' joke. DOS-styled 8-bit default version of textures, with reductions in detail, were released for Java Edition, available in versions of 1.12.x and 1.13 snapshots from 17w43a to 18w11a, with the thread claiming that all editions of Minecraft would eventually get the textures.[23]
The textures were reverted to the way they were before on April 2, 2018.[24] These textures cannot be re-activated by setting the device's date to April 1, 2018.
These textures only replaced the default textures, so using a Resource Pack would hide the textures the resource pack would change.
The Texture Update Beta Pack gallery on the Minecraft Marketplace in Bedrock Edition uses screenshots from the Java Edition.
In a now deleted Tweet, JAPPA announced on November 10, 2017 that the new textures would be available on "all versions" of Minecraft. However, the update has only been released on the Java Edition, Bedrock Edition, and PlayStation 4 Edition. The Xbox 360 Edition, Xbox One Edition, PlayStation 3 Edition, PlayStation Vita Edition, Wii U Edition, Nintendo Switch Edition, and New Nintendo 3DS Edition still have not received this update.[1]
The "polished cobblestone" on the piston prior to the texture update used to match the furnace top texture. After the texture update, they no longer share the same design.