Inevitable Rupture only apply 1 stack of Incision

Hello,

I think Inevitable Rupture is bugged.
I bought a Megalomaniac with Inevitable Rupture to be able to remove Incision support from my Spearfield and still be able to apply maximum Incision stacks. I can see Inevitable Rupture procs with 10% chance, this seems about right, but everytime it procs, it only grants 1 stack of Incision.

Something weird I found is that it seems that this 1 stack has the effect of 10 ie. the next attack will 100% bleed.
But if played with Thousand Cuts to grant Increased Phys Damage Taken per Incision, I think it count as only 1 stack.

When bossing I run Bloodlust on Spearfield to prevent Incision stacks from being consumed and Increase Damage Taken from my next Snipe, and I can stack multiple Incision from Inevitable Rupture only, each with a 10% chance, but it feels like whatever the number of IR Incision stacks, the next snipe will always bleed.

I don't know if this has anything to do with the fact that I got Inevitable Rupture from Megalomaniac, but I guess it might.

Thanks for looking into it.