Thanks, everyone! 
. Now all I need to do to get this into the marketplace is to buy a Mac Mini to debug weird issues that only happen on macOS 
. Jokes aside, this is exactly what I meant above with
It’s still early days for UXP in InDesign (which, in more than one place, is also quite noticeable), which means it’s totally understandable that some weird issues occur and we as the developer community still have to figure out best practices around it. So I would (and I’ll do the same) ask/encourage that we make a habit of documenting things like those in forum threads so that we can all benefit from each other and build the best plugins we can !