why my player can’t detect / avoid an enemy.?
you can check here :
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Also, the video is not working.
How to update the unwalkable node when the project is run? so a player can avoid enemies
I give the collider (trigger) on the enemy
Local avoidance is much better for this. You would use pathfinding for long-term planning and local avoidance for short term planning.
See https://arongranberg.com/astar/docs/local-avoidance.php