Hi @spacedesk-christian,
I see a similar behavior with an iPad 9 (iPadOS 17.0.3).
Connecting via network works without any issues. Only the presented desktop is rotated by 180°.
Current workaround: locking the screen in iOS and rotating the iPad by 180°.
If you need more detailed information and/or maybe testing on other iOS/iPadOS devices, please ping me by email. (#Support free software for private use)