The behavior you're experiencing with your Surface Pro 11, where it requires a longer press of the power button to boot properly, could be related to a few factors. It might not necessarily be a bug but rather a feature or a quirk of the device or the Windows 11 operating system.
Sometimes, devices may enter a low power state or hibernation, which can cause issues during the boot process. Holding the power button longer typically forces a complete power cycle, which can help in resetting the device and allowing it to boot normally.
If this behavior persists, it may be worth checking for any firmware or system updates that could address booting issues. Additionally, running the Surface Diagnostic Toolkit (SDT) can help identify any underlying problems with the device.
For further assistance, you may want to consult Microsoft support or check for any known issues related to Windows 11 version 25H2 that could be affecting your device's boot process.