The issue was resolved by clearing application previews when content is deleted. This issue is fixed in iOS 13.4 and iPadOS 13.4. A local user may be able to view deleted content in the app switcher.
Apple Security Advisory 2020-03-24-1 - iOS 13.4 and iPadOS 13.4 are now available and address buffer overflow, code execution, and cross site scripting vulnerabilities.