Put this in your anim blueprint, connected to the “Event Blueprint Update Animation” not to the Event Tick.
Can I see a screenshot of your anim montage where it show the tracks in “Sections”, like in your third screenshot but scrolled down
Same behavior when the logic is inside the anim blueprint.
The isAceno boolean comes from the input. I checked and it stays true as long the input is held. But the animation plays one time and stops.
The “Default” in your track should be blue with a “X” next to it, meaning it will loop.
Your blueprint is good so it will be ok after you set the loop in the montage.