Bug AsyncGPUReadback in Chrome

Hi, I'm trying to use AsyncGPUReadback to get data from the GPU asynchronously. I need to render several times to the same texture and then get data on CPU. The following code works as expected in Editor, but when I run it in Chrome, I found that it takes much more frames than I expected.

Code (CSharp):

1. public class AsyncGPUReadbackTest : MonoBehaviour
2. {
3.     [SerializeField]
4.     private Camera orthographicCamera;
5.  
6.     [SerializeField]
7.     private Button button;
8.  
9.     [SerializeField]
10.     private TMP_Text txt_Time;
11.  
12.     private NativeArray<Vector4> nativeArray;
13.  
14.     private int framesCount = 0;
15.  
16.     private void Awake()
17.     {
18.         button.onClick.AddListener(OnButtonClick);
19.         orthographicCamera.targetTexture = new RenderTexture(256, 256, 24, RenderTextureFormat.ARGBFloat);
20.     }
21.  
22.     private void Start()
23.     {
24.         nativeArray = new NativeArray<Vector4>(256 * 256, Allocator.Persistent);
25.     }
26.  
27.     private void Update()
28.     {
29.         framesCount++;
30.     }
31.  
32.     private void OnButtonClick()
33.     {
34.         button.enabled = false;
35.         for (int i = 0; i < 200; i++)
36.         {
37.             orthographicCamera.Render();
38.         }
39.  
40.         framesCount = 0;
41.  
42.         AsyncGPUReadback.RequestIntoNativeArray(ref nativeArray,
43.             orthographicCamera.targetTexture, 0, TextureFormat.RGBAFloat, OnCompleteCallback);
44.     }
45.  
46.     private void OnCompleteCallback(AsyncGPUReadbackRequest obj)
47.     {
48.         txt_Time.text = $"Frames Count {framesCount}";
49.         button.enabled = true;
50.     }
51.  
52.     private void OnDestroy()
53.     {
54.         button.onClick.RemoveListener(OnButtonClick);
55.         nativeArray.Dispose();
56.     }
57. }

I found out that the duration of AsyncGPUReadback depends on amount of calls camera.render. But I don't understand, why?



It's also interesting that this code works fine in Firefox.