Hello,
I don't know if the last patch has impacted the drop rate of some leads, but as from the very day when update number 32 was out, I wasn't able to get the lead for the "Branch of Falinesti" and the "Remnant of the False Tower" anymore. Yet, I remember when I did my survey with my crafter some days before this update, I immediately found the lead of the latter in Rivenspire. The lead of the remnant of the false tower was hidden in a node, a rich rubedite ore. I excavated all of the antiquities mentioned above beforehand, so technically, I should have been able to get another lead for these two. I've even seen videos on Youtube where people were able to spot the lead very quickly several months earlier.
https://youtube.com/watch?v=BGU6wJcO-PE
As the last update included a change to enhance the chance for missing set pieces to drop, I can't do much but make assumptions about a possible collateral damage with the drop rate of some specific leads. Has anybody experienced the same thing the last few days?
PS: I can testify however that the drop rate was unchanged for the "Void-Crystal Anomaly" since I could easily get the lead from any alchemical plant in the Court of Contempt, so if the bug is real, I confirm that it doesn't affect all the yellow leads!