Selected object in locked layer
Objects remain selected when I move them into a non-visible group/layer and lock the group/layer. It is not possible to deselect the object until you unlock and make visible the group. So far I've been able to recreate the problem every time I've tried.
Mariela Hristova commented
Happens to me also. It is very frustrating, especially when I try to resize another object or a text field. Selecting the desired object creates an enlarged Transform Controls frame which includes this locked object (which could also be not locked and does the same)