UIDocumentPickerViewController allows to select file declared in Info.plist document types even when restricting to folder UTI

My document-based UIKit app can open plain text files such as .txt files.

When tapping a particular button I want to be able to select a folder, but when using the code below, the document picker allows me to select folders as well as .txt files:

class DocumentViewController: UIDocumentViewController, UIDocumentPickerDelegate {

    override func viewDidAppear(_ animated: Bool) {
        let documentPicker = UIDocumentPickerViewController(forOpeningContentTypes: [.folder])
        documentPicker.delegate = self
        present(documentPicker, animated: true)
    }
    
}

If I remove the text file entry from the Info.plist's document types list, it works as expected. Is this a bug and if yes, is there a workaround?

	<key>CFBundleDocumentTypes</key>
	<array>
		<dict>
			<key>CFBundleTypeName</key>
			<string>Text</string>
			<key>CFBundleTypeRole</key>
			<string>Editor</string>
			<key>LSHandlerRank</key>
			<string>Default</string>
			<key>LSItemContentTypes</key>
			<array>
				<string>public.text</string>
			</array>
		</dict>
	</array>

I created FB22254960.