From MMORPG: “The patch is meant to bring about several improvements and fixes, while also bringing some improvements and fixes to Mac, PvP, and crashes. The more general fixes include bug fixes addressing map bosses failing to transition to their next phase, certain monsters becoming immune during Ritual encounters, and Talismans dropping without anointments on Distant Memories.”
Source: N4G PC Path of Exile 3.13.1e Patch Drops This Week Bringing Improvements and Fixes