Zerphi's Heart not stacking/reseting Soul Eater

Zerphi's Heart
"gain soul eater for 10 seconds when you use a vaal skill"

I have my setup with Soul Catcher and Vaal Ground Slam to be able to use this skill twice within 10 seconds. However, this does not reset the Soul Eater to 10 seconds, nor does it stack. The Soul eater seems to end after 10 seconds, no matter how many vaal skills I use during the 10 second period.

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Mark_GGG wrote:

Each instance of soul eater is independant, and keeps track of souls eaten for that instance. Each enemy only has one soul, so it can only be eaten by a single instance of soul eater. When that instance expires, all the bonuses from souls eaten by that specific instance of soul eater go away, and other instances can start eating souls.

I did some testing and it does not work as described. Using a vaal skill again during the duration of Soul Eater does not create new instances, so the vaal charges are wasted. It starts accumulating souls again only once a vaal skill has been used after Soul Eater has ended. This feels really clunky to play as you have to be careful not to spend your vaal skill too early.

I'm pretty sure it was possible to chain Soul Eater before as OP expects. Was this a stealth nerf? I cannot find anything about Zerphi in patch notes for either 3.7 or 3.6.

I just tried it aswell and it doesn't work like Mark explained it. Can we get a clarification on this?