[Unity project]Screenshot of ScreenCapture.CaptureScreenshot () turns black image on iPad

I used ScreenCapture.CaptureScreenshot () to take a screenshot, but the result was a black image.

ScreenCapture.CaptureScreenshot (fileName);

float latency = 0, latencyLimit = 40;

while (latency <latencyLimit)
{
if (File.Exists (path)) {
break;
}
latency + = Time.deltaTime;
yield return null;
}

However, it does not occur in the lower version of the application developed here,
It is a black image in the latest version.
It does not occur on the old iPad terminal iOS9.3.5, but it occurs on devices with OS13 or later such as iPad Pro.
I changed "Anti Aliasing" to "Disable" in Unity settings, but it was not improved.

I changed the process of displaying the taken screenshot as a texture and changed the UI process around it, but I can not understand the cause well because the code to take the screenshot has not been changed.

It would be helpful if you could tell me if there were any improvement settings here.

Development environment
2018.3.13f1
[Unity project]Screenshot of ScreenCapture.CaptureScreenshot () turns black image on iPad
 
 
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