Filters in Quick Collection do not work, Lightroom Classic on Mac

UPDATE | Somehow fixed the issue. Despite the dropdown menu in bottom right said "No filter" (see below)...

... I selected (again, just to be sure) the option "Filters Off" ... 

... and voila! - it works now as supposed! Interesting, because this issue was only in Quick Collection, not affecting any other folder or album.

Quote:

No photos match the filter" ... despite there are photos that certainly match

End Quote:

Are these photos that Do Match IN the Quick Collection?

I suspect they are Not actually listed in the collection that is marked as the quick collection.

Or you are trying to select more than One Attribute in the Filter Bar and none of the images have both of those attributes placed on them.

Here are some screen shots to show what I am suggesting.

Here is the Quick Collection selected that has 82 images add to it and No Attribute in the filter bar selected.

Now in the Filter Bar I select 3 stars or greater and those images that have 3 stars or greater only show in the Grid view area. Note that no color label is selected in the Filter Bar.

Now if I then select the color label Red this is what I get in the grid view.

That is because none of the images have BOTH a 3 star rating AND the Red color label.

But if I add a 3 star rating to one of the images that has the Red color label this is what I get when I select BOTH 3 star rating and Red color label.

Images have to match ALL of the Attributes you have selected in the Filter Bar for them to show up.

I can't duplicate on MacOS 10.15.4 and Lr9.2.1.  Post a screenshot of your filter bar at the bottom right above the thumbnails.  

I can't duplicate this on Windows 10.

Show us a screen capture so we can see what you are seeing.