YES! it happens the same to me too, I have made favorite a filter, and as I do not remember I have already done it, I again try to make it favorite and have the same message "This filter is already in your Favorites"
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The filters in my "Favorites" have a little star on the icon. Well that's kinda dumb because since I'm in the Favorites category, they're obviously 'favorited' filters |
YES, is true

the little stars ONLY appears when you have selected the favorites folder and not outside of it, so it is a pity that they are lost outside of the favorites folder.
CHANGE THE MENU TOO?
Also I have seen that when inside the favorites folder, if you click on any of these filters there is no option to make this filter favorite again, as obviously you are inside the favorites folders
So, my possible suggestion it can be also as an possible alternative, that in the context menu that appears when right clicking on a filter outside of the favorites folder, it would be good that it could put something like "Delete from favorites" instead of "Add to Favorites" so you would quiclky know that this is already added and not try to add it again.