Hi Bungie,
EDIT -- it may have something to do with Piercing Bowstring, credit and source to:
https://www.reddit.com/r/DestinyTheGame/comments/t0f4jf/piercing_bowstring_breaks_wishenders_broadhead/?utm_source=share&utm_medium=web2x&context=3
I am one of the .001% or so of players who uses Wish-Ender, so I am aware this is a very low priority issue. However, I've been doing some testing, and found that as recent as the Witch Queen, Wish-Enders Broadhead perk is simply not proccing. It will strangely do massive damage to red bars, but yellow and bosses it does less than half what it should, with no visible indication that the second pip of damage is occurring.
I included a study I did about 8 months ago when broadhead was still working. Now you get about 25k~ on a crit against red bars (only one number) and 8-9k against bosses (only one number, meaningfully lower)
Let me know if you find anything out about this, I'd love to make this underappreciated weapon my main stay!
Cheers,
-404