I have an armory slot for T16 with “In-Geom” and “Orb of Infinite Depth” (primordial) and a second one for GR with “The Grand Vizer”.
The gems and everything else gets replaced correctly, but when chaing from a 2-Hand to 1-Hand and Primordial Source, the source does not get equipped at the first try, I have to click equip a second time in order for it to equip correctly.
This does not happen when using an Ancient or Normal legendary source, just with Primordial.