I don't even know how to explain this

[trim grove]

When it plays the idle animation, for 1 frame it changes to other

extends CharacterBody2D


var target_zoom = Vector2(1, 1)
@export var speed = 200
@export var friction = 1
@export var acceleration = 0.1
@onready var sprite_2d: Sprite2D = $Sprite2D
var facing = "down"


func _ready():
    target_zoom = $Camera2D.zoom
    
func get_input():
    if Input.is_action_just_released("ZoomIn"):
        if target_zoom.x <= 3.5:
            target_zoom += Vector2(0.5, 0.5)
    elif Input.is_action_just_released("ZoomOut"):
        if target_zoom.x >= 2.5:
            target_zoom -= Vector2(0.5, 0.5)
    var input = Vector2()
    if Input.is_action_pressed('Walk_right'):
        input.x += 1
    if Input.is_action_pressed('Walk_left'):
        input.x -= 1
    if Input.is_action_pressed('Walk_down'):
        input.y += 1
    if Input.is_action_pressed('Walk_up'):
        input.y -= 1
    return input


func _physics_process(delta):
    var direction = get_input()
    if direction.length() > 0:
        velocity = velocity.lerp(direction.normalized() * speed, acceleration)
    else:
        velocity = velocity.lerp(Vector2.ZERO, friction)
    move_and_slide()
    $Camera2D.zoom = $Camera2D.zoom.lerp(target_zoom, 5 * delta)

    if velocity.is_zero_approx():
        $Sprite2D/AnimationPlayer.stop()
        $Sprite2D/AnimationPlayer.play("idle_" + facing)
        print("idle_" + facing)
        print($Sprite2D/AnimationPlayer.current_animation)
    else:
        if velocity.x >= 1:
            $Sprite2D/AnimationPlayer.play("run_side")
            facing = "side"
            sprite_2d.flip_h = false
            
        elif velocity.x <= -1:
            $Sprite2D/AnimationPlayer.play("run_side")
            facing = "side"
            sprite_2d.flip_h = true
        
        elif velocity.y <= -1:
            $Sprite2D/AnimationPlayer.play("run_up")
            facing = "up"
            
        elif velocity.y >= 1:
            $Sprite2D/AnimationPlayer.play("run_down")
            facing = "down"
    
    

When I face up it always plays the idle_down
but when I face down it plays idle_side

I figured out that the problem doesn't happen when I stop playing the run animations, but i still cant fix it

[rugged socket]

I cannot see any immediate issue here.
It may be an issue with the names of the animations. Remember they are case sensitive

[trim grove]

Unfortunately that's not the problem 😦

Idk if it's ok to create animations like that

I'm using one single sprite 2d, and when i need to use an animation from other sprite i just use the texture key

[rugged socket]

That is fine.
Make sure the texture key is set properly tho

[trim grove]

It is

Is there any chance of this being a godot 4 bug?

[rugged socket]

It makes no sense for this to be an engine bug.
i would use breakpoints to see the exact order of calls and follow the state of the animation line by line.

[trim grove]

But idk what am i supposed to check

cuz when i debug it says that there's no problem at all