Keyboard reverting on reboot

I'm having an issue with the keyboard reverting after OOBE.

I'm using an English (UK) Windows 11 25H2 base image (deliberately — I want English display language, with Swedish keyboard/regional settings applied without needing to install a Swedish language pack). Deployment is native Windows Autopilot, no third-party tooling involved.

Autopilot deployment profile: Language (Region) = Swedish (Sweden), Automatically configure keyboard = No.

During OOBE, I manually select Swedish keyboard, and it's correctly applied — it's still Swedish through the first user logon. But after rebooting the keyboard silently reverts to English (UK). This is regardless of if I run pre-provisioning or user-driven.

Is this a known/new behaviour, and how can I fix it?