Unable to block excluded folders from custom search scope

I loaded a php symfony projected as a new project into IntelliJ and it automatically added most everything in vendor/* as Excluded in the Project Settings > Modules section. When searching, if I search with a scope of Project and Libraries then it includes them, and if I search with a cope of Project Files then it does not. All of this behavior is great.

The problem manifests when creating a custom scope. These automatically excluded folders do not show up as folders that can be blocked. As an example in the following image, I removed burgov from the project modules excluded list, but all these other folders are still marked as excluded and hidden.

And what the real problem is, is that if I exclude vendor from this dialog recursively ( !file[PROJECTNAME]:vendor//* ), it still searches within all of these excluded folders.

So long story short, there is no way for me to block from searching those folders in a custom scope.

Am I missing something, or should I submit a bug report?