I have a Unity project, and I put a folder at the same level with the Assets folder. Its content are always marked as "no index" regardless of content type and folder name. When I use "Start Index" to the folder it start to index as expected. But after a Unity project refresh, the folder is always marked as "no index" again. Use "Attach to Solution" does not work.
This problem appears since 2019.1. Am I missing something?