Minecraft wiki entry for Obtaining_discontinued_block_configurations, associated text: Prior to 1.16.2, endermen could pick up snowy grass, mycelium and podzol blocks. Upon placing these down, they would still have the snowy block state set to true, but there would be no snow on top. Indeed, endermen which are holding these blocks in the first place (alongside other things, such as netherrack, or indeed any block from around their introduction) are also a discontinued feature.