So for the longest time (actually ever since Electrocute exists), Lux passive did not count as a separate damaging attack for the means of getting those 3 to proc the keystone.
However, It now again seems to.
Which means Any 1 spell + AA will proc electrocute. Any 1 spell + Ult will proc electrocute.
Now, I wouldn't be complaining about this being a thing again as it used to be with Thunderlord's decree. But iirc it was confirmed to have been intentionally changed to not do that as Electrocute was introduced.
Not being able to find anything in patch notes that could relate to this, I wonder if anyone has stumbled across any indication as to whether this is considered a bug or is here to stay?