After updating Windows 11 26H2 Release Preview from Build 26300.9445 to Build 26300.9539, F1 25 can no longer launch because EA Javelin AntiCheat blocks/restricts the game during startup.
The issue started immediately after installing Build 26300.9539 and reproduces every time, including after restarting the PC. Secure Boot and other system security settings were not changed.
Rolling back to Build 26300.9445 immediately resolves the issue, and F1 25 launches normally again. Reinstalling Build 26300.9539 causes the issue to return.
This strongly suggests a compatibility regression between Build 26300.9539 and EA Javelin AntiCheat / Windows Insider certificates. Please investigate.