Note from iOS App gets duplicated till infinity and spams the server

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Steps to reproduce

1. Connect iOS App to nextcloud Hosting
2. Create Note and add some Text
3. Open Notes app in web browser

Expected behaviour

There should be only one note with the title I created.

Actual behaviour

Nextcloud Notes seemingly can't sync properly and creates the same notes over and over again, with the number in the filename. Like this
Somenote (721).md

Currently there's 721 Versions of the same note. It seems like it's three different versions of the same note (each from a different stage of completing the note), created over and over again.

Error Log

There is an error in the log with probably the root of the problem:
`NotPermittedException Could not create path "/admin/files/Notizen/Somenote (719).md"
Controller failed with OCP\Files\NotPermittedException

Maybe it's a misconfiguration on the server side? Still, I'd expect the App to fire an error instead of creating a bazillion files.

Server configuration

Web server, Database, PHP: cant tell, it's on a hosted server

Nextcloud version: Nextcloud Hub 9 (30.0.1)

Browser

Browser name: Firefox

Browser version: 132.0.2

Operating system: iOS just updated to 18, it was probably iOS 17

Start with the listed reproduction steps and the NotPermittedException in the error log, then trace the iOS note-sync path responsible for creating files. No source file or test is named in the issue. Done means reproducing the failure and preventing repeated duplicate notes while handling the server error visibly.