User-Agent:       Mozilla/5.0 (Windows NT 10.0; rv:103.0) Gecko/20100101
Firefox/103.0
Build Identifier: 

When changing the APN when using `nm-connection-editor`, system systematically
fully hangs

Reproducible: Always

Steps to Reproduce:
1. Have a `ModemManager`-compatible modem and have ModemManager.service enabled 
2. Open `nm-connection-editor` (installable via
`NetworkManager-connection-editor`)
3. Use the `+` and choose `Mobile Broadband`
4. Pass through the wizard choosing an ISP and arrive on the editing page
5. Use the `Change...` button
Actual Results:  
Spawning the wizard makes the whole system deadlock requiring a force-reset of
the system

Expected Results:  
The wizard is re-ran and works as expected by changing the APN

NetworkManager 1.38.2
ModemManager 1.18.6
NetworkManager-connection-editor 1.28.0

Snapshot 20220805
DE : Plasma 5.25.4 (Wayland)
WM : kwin

Suspecting a wayland/KDE issue, see attached logs