Because the official Minecraft 1.21 update includes complex new rendering mechanics, new mob AI (the Breeze), and extensive world generation code (Trial Chambers), it takes developers a significant amount of time to port these features to the web format. While you may see links claiming to offer "Eaglercraft 1.21," they are often misleading or unsafe.
: A block that spawns and protects the Creaking; it must be destroyed to defeat the mob. Pale Oak & Moss eaglercraft 1.21 4 download