Bite the Bullet not working when healing self

Efrost

Bite the bullet is behaving very oddly.

While playing Claudette, at random Bite the bullet is not working when self healing. I was using Bite the Bullet, Botany Knowledge, Wicked, and Strength in Shadows.

I have tried testing order of perks. I tried Testing it was map dependant, I tried with or without med kit. It just sometimes does not offer the silencing effect for self healing.