I have a symbol that contains a single curve with a fill and a stroke. This symbol is used in dozens of places across multiple artboards. Today, I decided to tweak the color of the curve. At first everything worked as expected: changes to the first instance of the symbol were reflected in all symbols. But then, I pressed undo. AF undid the last change to the stroke of the first two instances of the symbol, but none of the rest. Now when I hover over the symbol (and the curve) in the Layers panel, it says that fill and stroke are unlinked attributes. For all of the instances of the symbol that I was not editing, the fill and stroke attributes became unlinked.
There are two issues:
Undo should not unlink attributes
There is no way (that I can find) to relink (resync?) attributes.