EarlGrey can't interact with an app systemalert

My problem is, at the end of my test i get an systemalert from the app. In this systemalert (what pops up after a tap on 'logout') would be the user asked something like 'delete favourites', or 'keep it on device' etc. My problem is, i can't tap on oneof the buttons in these systemalert.
Is is a bug, or is it my mistake?

In an ios inspector is it shown like

[XCUIElementTypeAlert :: Keep Favourites?]
[XCUIElementTypeOther]
[XCUIElementTypeOther]
[XCUIElementTypeOther]
[XCUIElementTypeOther]
[XCUIElementTypeOther]
[XCUIElementTypeOther]
[XCUIElementTypeOther]
[XCUIElementTypeOther]
[XCUIElementTypeOther]
[XCUIElementTypeOther]
[XCUIElementTypeStaticText :: Keep Favourites?]
[XCUIElementTypeStaticText :: Do you want to keep the products in Favourites on your device? If you delete your Favourites from your device, you can restore them at any time by logging back in.]
[XCUIElementTypeOther]
[XCUIElementTypeOther]
[XCUIElementTypeOther]
[XCUIElementTypeOther]
[XCUIElementTypeOther]
[XCUIElementTypeOther]
[XCUIElementTypeOther]
[XCUIElementTypeButton :: Keep on device]
[XCUIElementTypeOther]
[XCUIElementTypeOther]
[XCUIElementTypeOther]
[XCUIElementTypeOther]
[XCUIElementTypeButton :: Delete from device]
[XCUIElementTypeOther]
[XCUIElementTypeOther]
[XCUIElementTypeOther]
[XCUIElementTypeOther]
[XCUIElementTypeButton :: Stay logged in]

No source file, test, or entry point is named. Start by reproducing the logout system alert and comparing the displayed XCUIElement hierarchy with EarlGrey's documented alert interaction support; done means determining whether the listed buttons can be targeted and identifying whether the behavior is a framework bug or a test usage issue.

Written by the indexing model from the issue text.