Seems like all is perfect with parry. Working as intended 100%.
Oh, wait...
Nebula triggering shock but no parry. Cool.
https://streamable.com/gxvja
Parrying Yondu on master quest, chapter 3.1. Parry successful (appearing on screen) but no stun :
https://streamable.com/skvxv
Awesome job, it's working great !