UiObject2 referring to wrong element

Referring to previously created `UiObject2` object which is not exist in the screen (in the same activity) pointing to a random element instead of throwing `StaleObjectException`.

Example code snippet:

```
UiObject2 elementInScrollView = mDevice.findObject(By.desc("Auto Complete"));
elementInScrollView.getText();
//returns "Auto Complete"

//scroll down to make sure that "Auto Complete" not present in the screen
mDevice.swipe(100, 400, 100, 50, 100);

elementInScrollView.getText();
//returns some random element text in the screen ex: List

mDevice.pressBack();
elementInScrollView.getText();
//throws `StaleObjectException`
```

Device API Level: 23
AUT: API Demos(Inbuilt app)

I suspect something wrong to `AccessibilityNodeInfo` [here](https://github.com/android/platform_frameworks_base/blob/master/core/java/android/view/accessibility/AccessibilityNodeInfo.java#L772) when `getAccessibilityNodeInfo` called from [UiObject2](https://android.googlesource.com/platform/frameworks/uiautomator/+/android-support-test/src/main/java/android/support/test/uiautomator/UiObject2.java#625)

PFA screenshot for the functional understanding.


Reproduce the behavior on API level 23 using the API Demos example and the existing UiObject2 and AccessibilityNodeInfo code linked in the report. Check why a previously found object returns another element after scrolling; done means the missing object throws StaleObjectException instead of returning unrelated text.

Written by the indexing model from the issue text.