When it finally works on 1.21.1, the addon unlocks a "nerd vision" of the game that ordinary players never see:
Follow these diagnostic steps in order. The solution to “meteor rejects addon 1211 work” is rarely one-size-fits-all, so approach systematically. meteor rejects addon 1211 work
In the Meteor API (commonly used in addon development), text is often handled to prevent crashes. When it finally works on 1