Language Issues with Autopilot (Intune)

We install our HP and Lenovo notebooks using Autopilot. The image (Win11 24H2, 25H2) and settings are on a bootable USB drive. The language (German - Switzerland) is set as the default and integrated. However, since April 2025, the language is not being correctly assigned; it always defaults to German (DE - Germany). Since the user has to enter their email address after installation, the @ symbol is not detected. According to Microsoft, this is a known issue (see article from April 2025). Does anyone have a workaround? Scripts and similar solutions don't work because the system always defaults to German (DE - Germany) after the initial installation. Has anyone else experienced this problem?