Leap Slam stun potential bug?

Leap Slam + Endurance Charge on Melee Stun doesn't seem to be working properly for me. I noticed I wasn't receiving endurance charges very often and tried making sure nothing was hitting enemies before my leap slam does. The issue seems to be that enemies aren't being stunned by leap slam despite being on full health. The weird thing is it works about 20% of the time or so. Am I missing something?

I'm having very similar experience. Endurance charge generation from this setup is very miserable, A LOT worse than it was pre-3.7. Not to mention I'm 2h mace with a lot of stun modifiers, so I should stun anyway since I nearly 1shot trash mobs with my leap slam, yet I get endurance charges very occasionally. It's near to impossible to maintain base 3 endurance charges while constantly leaping over enemies.

Something for sure is bugged and not working as intended.

GGG please investigate!!!

Also please MOVE THIS POST TO BUG SECTION!

Did some testing. It seems to be an issue (in my case) with Oni-Goroshi in combination with this gem setup. When I swap weapons, charges are generated consistently as they should be, but back down to rarely when Oni is equipped.