UIVisualEffectView's subviews not shown in XCUIApplication().debugDescription

I have a UIVisualEffectView with 2 subviews added in the UIVisualEffectView's contentView. This works fine when running normally, but when I try to add UI Test to check that the correct subviews are added, XCUIApplication().debugDescription does not show the UIVisualEffectView's subviews - it only shows the UIVisualEffectView.