not grouping bug

If the grouping is disabled, and you open two instances of a pinned app, one of those two keeps the 'pinned' tag (or whatever) so if you close it the other one is not merged into the pinned item. At the end you have the pinned item 'not-launched' and the second instance, both with the same application ID.
Expected behaviour: the pinned item to not be visible, as there is an instance open.
Current fix: enable/disable again the grouping.