Download builder problems

I'm doing the next:

1. I'm go to https://jquerymobile.com/download-builder/
2. choosing 1.5.0-rc1 branch;
3. selecting all cores, widgets, etc (everything);
4. downloading is doing well

So the problem is I cannot find "ui-popup-hidden" (particularly) in any of downloaded css. As the result the popup widget don't want to work properly.

Also just selection of the popup widget to build - and it will not work (all dependencies are selected by default). Appending by hand all items from the "core" tree will solve this problem.