问Physics2D.OverlapBox显示出不一致的行为

EN

using UnityEngine;

public class Player : MonoBehaviour
{
    public float movespeed = 5f;
    public float jumpforce = 5f;
    public Rigidbody2D player;

    public LayerMask layerMaskPlatforms;

    private float movementHorizontalInput;
    private bool jumpInput;

    private float lastTimeOnGroundInSeconds = 0f;
    private float lastTimePressedJump = 0f;

    void OnBecameInvisible()
    {
        // todo: restart game
    }

    void Update()
    {
        movementHorizontalInput = Input.GetAxisRaw("Horizontal");
        jumpInput = Input.GetButtonDown("Jump");
    }

    void FixedUpdate()
    {
        if (jumpInput)
        {
            AttemptJump();
            lastTimePressedJump = 0.2f;
        }
        else if (lastTimePressedJump > 0)
        {
            AttemptJump();
            lastTimePressedJump -= Time.deltaTime;
        }

        if (IsOnGround())
        {
            lastTimeOnGroundInSeconds = 0.2f;
        }
        else if (lastTimeOnGroundInSeconds > 0)
        {
            lastTimeOnGroundInSeconds -= Time.deltaTime;
        }

        player.velocity = new Vector2(movementHorizontalInput * movespeed * Time.deltaTime * 50f, player.velocity.y);
    }

    private void AttemptJump()
    {
        if (lastTimeOnGroundInSeconds > 0)
        {
            player.AddForce(new Vector2(0, jumpforce), ForceMode2D.Impulse);
            lastTimeOnGroundInSeconds = 0;
        } 
    }

    private bool IsOnGround()
    {
        Vector2 groundedCheckPosition = (Vector2)transform.position + new Vector2(0, -0.01f);
        var overlapBox = Physics2D.OverlapBox(groundedCheckPosition, transform.localScale, 0, layerMaskPlatforms);
        return overlapBox;
    }
}