I have a latest upgraded AlloyTech templates. I have taken Ben's add-on and upgraded it and it does not get recognized with the same module.config in Alloy and add-on (the path to a js file is wrong). Several of my add-ons didn't work until I changed module.config in Alloy to absolute paths:
I cannot find anything in the breaking changes for 11 that could be related.
Ben = Ben McKernan :)
Hey, hopefully this blog post answers your question: https://world.episerver.com/blogs/Ben-McKernan/Dates/2018/1/issue-with-modules-not-being-found-in-cms-11/