I thought this was a bug a long time ago but I think it is just a poor design. The main issue everyone is having is it is not very clear that a folder can be a favorite by itself and also part of several groups. I can duplicate what Patrick Philippot shows as a bug but it is not a bug but just that the A and B folders are in groups. The only sure way to know what is going on is to do the unmarking and marking in the dropdown above the filmstrip. For instance, unmark ALL the favorites and then select both Folders A and B and mark as a favorites. A and B is a favorite GROUP. You can STILL mark A and still mark B as separate favorites. This is not a bug.
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