smart guides not working in clipping mask
I have had this problem for probably the last 3 versions or more ... but generally, when I've masked a number of objects inside of a clipping mask, then double-click to edit the contents inside the clipping mask, smart guides no longer function. Or, more correctly, very occasionally they will, but generally not.
I always update to the latest versions of Illustrator. Currently i'm using 25.2.1