[1.6.1][Bug] Unable to boot ZimaOS normally

[gooberwithatophat]

What happened?

I'm unable to boot ZimaOS by simply turning on my PC. Whenever I power my PC on (with the hard drive that has ZimaOS installed on it selected as the only boot option) it shows an error saying "Reboot and Select proper boot device or Insert Boot Media in selected boot device and press a key." The only way I'm able to boot into ZimaOS is by taking a USB drive with Ventoy on it, booting that, then booting ZimaOS via localboot. Any way to fix this?

Screenshots

[gooberwithatophat]

For the record, this has been happening since 1.5.1, so I doubt it's an issue with the version.