@tf2 I have two “newsfeed”-modules one over each other, both on the bottom-bar and it works
But this is an exception, if you want to double any other module you have to copy the original folder, rename the folder and use this name to change the corresponding *.js in the new folder. Additionally, rename the Module.register name inside the js-file.
You can verify your config.js here https://esprima.org/demo/validate.html for example.
Hope that helps,
Thomas