Raise zombie of falling lifespan is inconsistent

How to reproduce:

Get Perfect Crime, 1 Heartbound loop and CWDT linked to Raise Zombie of Falling, and a lot of recoup. Notice that in the buff bar the number of zombies sometimes drop to 1 for a split second, meaning that the 2 zombies did not die on the same frame

What should have happened instead:

The time between zombie summoning and death should always be the same (at least in perfect conditions like hideout)

Why I care:

It breaks the build I planned

Up

Not playing this next league, but I still think this should be fixed