Zarokh - hourglass mechanic bug

Hey guys,
I have a strange observation about the last Sekhema boss - Zarokh, I wonder if someone noticed something similar.
When the mechanic for hourglasses starts, the clock should work at the same speed all the time - at least from my previous experience.
However when I'm playing right now with a heavy stun build, I notice that sometimes the clock in the middle runs like 2x faster.
The window for gathering the hourglasses sometimes becomes 2-3 seconds and it's impossible to collect even 4, even though I run on 90%ms.
I know that they spawn in different locations and it might look like this, but for the past 10 runs I paid special attention to the timer in the middle.
And what I noticed is that when he gets heavy stunned and after that he launches the hourglass mechanics, the time for collecting differs.
I tried to do some runs without heavy stun around 60% hp and the timer was ok, but on the last try I clearly noticed that the timer was shorter than 3 seconds.

Hope it might be fixed, because I love doing sekhemas.