Filename bug with double letters

[komrokrier]

Steps to reproduce

1. Open iOS Nextcloud app
2. Upload any file with filename containing two letters in a row for example "Hammelstrasse__.jpg".
3. The file on the cloud will be namend "Ha27mmelstra35e__0218.jpg" for example.

Expected behaviour

The filename should be the same like written in the upload-gui at the iOS app.

Actual behaviour

Some double letters in filenames are going to be replaced by numbers after uploaded.

Screenshots

No screenshot available.

Logs

No log available.

Reasoning or why should it be changed/implemented?

Environment data

iOS version: iOS 17.4.1

Nextcloud iOS app version: Hydrogen for iOS 5.2.7.0 Nextcloud Server: 27.1.9