Inconsistent Gargantuar kill behavior in Vasebreaker mode

Hey, I’ve noticed something weird in Vasebreaker in Plants vs. Zombies.

When a Gargantuar is really close to the house (at the 3rd tile), the result isn’t consistent even with the exact same setup.

Most of the time:

• 3 vases behind the Gargantuar are enough to kill it before it reaches the brain.

But sometimes (maybe 1 out of 20 tries?):

• it suddenly survives just long enough to eat the brain at the last second.

Same thing happens in another setup:

• 2 vases behind + a hitting plant in front
• usually works fine, but occasionally… it just doesn’t.

It feels kind of random, like timing or damage isn’t always calculated the same way.
Makes it hard to plan anything, because a setup that should work sometimes just fails for no clear reason.