Preferences > Projects > Library paths' "Exclude Pattern" not working

Hi,

I've been with support for hours and hours trying to get the Exclude Pattern in the 
Preferences > Projects > Library paths to work with no success. 

My objective is to specify a root directory for an asset library which has a bunch of assets shared among artists. I want Recursive enabled so it would automatically scan the subdirectories for all the assets. 

LibraryRoot/Asset1/
LibraryRoot/Asset2/

LibraryRoot/Asset3/

...

Each asset subdirectory will look something like:

LibraryRoot/Asset1/asset.sbs
LibraryRoot/Asset1/WIP/asset1.sbs

LibraryRoot/Asset1/WIP/asset2.sbs

LibraryRoot/Asset1/WIP/asset3.sbs

...

WIP will contain development save iterations of the asset and should be excluded from the Recursive scan.

I've tried the following Exclude Patterns:

WIP

WIP/*

/WIP/*
*/WIP/*

.*[\\\/](?:WIP)(?:[\\\/].*)?$

also with and without quotations. 

Nothing works, it seems like it's completely ignoring everything in this field. 

Can anyone confirm if this works or doesn't work for them?

If this is confirmed as a bug, how can I submit it to be fixed urgently?
Sorry for the rant but support was not at all helpful. Unfortunately this can be said about all the times I've had to contact Adobe's support. They could take a lesson from Sidefx who respond professionally and fix bugs incredible fast.

Thanks in advance