Unity Rigidbody2D bug

There’s a bug where if I jump up the ladder and then grab onto the ladder heading down, when the player hits the ground the velocity doesn’t go to zero instead its at 4.6. Is this a Unity bug or did I do something wrong?

Video: https://youtu.be/JCC6d2kSCkE

This is the climbing-down code:

 void OnClimbingDOWN ( InputValue value )
 {
     if(capsuleCollider2D.IsTouchingLayers(LayerMask.GetMask("Ladder")))
     {
         Vector2 climbVelocityDOWN = new Vector2(rb2D.velocity.x, moveInput.y * climbSpeedDOWN * -1);
         rb2D.velocity = climbVelocityDOWN;
         rb2D.gravityScale = 0f;
         bool playerHasVerticalSpeed = Mathf.Abs(rb2D.velocity.y) > Mathf.Epsilon;
         animator.SetBool("IsClimbing", playerHasVerticalSpeed);
         Debug.Log("ClimbingDOWN");
     }
 }