I just wanted to tell you guys that I have been watching my records and I have seen that superior sigil of cleansing doesn't work with the Alchemy Grand Master trait line in engineer.
Please fix the bug!
Thanks in forwards!
I've just confirmed that it does in fact work (at least in WvW)... entering holo mode with cleansing + PoP converted conditions to the correct boons.
Btw I don't know if any of that shows up in the logs or not, I was simply watching my conditions/boons while testing.