Bug Some animator states will restart after a couple of frames (creating a visual glitch)

Hey ! I have a situation where I have 3 states for an attack sequence (windup, action, recovery).
The states are linked together with 1 transition which has:

Exit Time = 1
Transition Duration = 0

And no other conditions.

In Play Mode, 99% of the time, the action phase will start playing, then after a couple of frames, will restart from the beginning, causing the animation to "rewind" and creating a visual stutter. Same for the Recovery animation.

When just stepping (ctrl + alt + p), the issue happens only 1% of the time.

Here's a gif of it running at normal speed (it's quick, more noticeable on "recovery" in the gif):


Here is stepping in editor:


This is also noticeable in build. There is no code calling these states. It's not just a state machine visual bug, I can see the character also going back and glitching in the scene.

Anybody with the same issue ?
Any fix or insight would be greatly appreciated

 

For anyone having this issue:
I've done a lot of other tests.

The only thing that fixes it for me is having
EXIT TIME = 0.9
TRANSITION DURATION 0.1
(although I'd have preferred not having any transitions)

Anything with EXIT TIME = 1 can trigger the issue