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Since version 1.16.210, addons that add new tools and that have textures with resolutions higher than 16x16 started to look that way and the higher the resolution of the element, the larger it looks in the player's hand, the support of armor or mob. Truth is, I'm not sure if it's a bug or if it has to be adjusted in some way from the texture pack files, but this didn't happen in previous versions. Not to mention that as of this version, the blocks you add with addons with 3d models look a bit strange and that I can't even load my skin into the game.