A bug in iOS 13 and iPadOS affects keyboard apps. They can be granted full access even if you haven’t approved that.
Third-party keyboard extensions in iOS can be designed to run entirely standalone, without access to external services, or they can request “full access” to provide additional features through network access. Apple has discovered a bug in iOS 13 and iPadOS that can result in keyboard extensions being granted full access even if you haven’t approved this access.
Because Apple mentions an “upcoming software update” I assume this bug also affects iOS 13.1.