It has been reported that the focus restoration to the formerly active element when closing the dialog does not always work properly on iOS. It is unclear what causes this or even if it happens consistently. Refer to issue #102 as a reference.
aria-hidden appears to be sometimes read by VoiceOver on iOS and macOS. It is unclear in which case this happens, and does not appear to be an issue directly related to the library. Refer to this WebKit bug for reference.