External Sites: Redirect flag not working on iPad app

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Steps to reproduce

1. Create link to external website and assign it to the page header menu (in german: "Kopfbereich).
2. Check the checkbox for redirect (in german: "Diese Seite erlaubt keine Einbindung." ~ "This page does not support embedding.").
3. Wait for synchronization.
4. On iPad, open the Nextcloud App.
5. Click on "More" to get the main menu.
6. Click on the created link.

Expected behaviour

The website should be opened in the default web browser.

Actual behaviour

The website opens inside the Nextcloud app.

Server configuration

Nextcloud version: Nextcloud Hub 8 29.0.5

Reproduce the issue on an iPad using the listed external-link and redirect-flag steps, then trace the app's handling of that link from the More menu. Done means links marked as not embeddable open in the default browser instead of inside the Nextcloud app.